Lots of good input since I gave my short input early on.
I say you want to move into teaching/education, and I second the input you have received about it not being stress free by any stretch of the imagination. My wife changed careers from corporation positions in technology and project management and changed careers to be a reading specialist. She helps students with learning disabilities, mainly dyslexia and such. She started out in private practice, found it hard to generate enough clients, and took a position at a private school (you cannot teach at most public schools without a Masters in Education, so keep that in mind) and has been there for four years. She loved it initially, but then the bureaucracy that is unique to education started to grind on her, and she has made the decision to once again go into private practice. At this point, five years in, she has a reputation in the educational community which she did not when she changed careers and it does seem as if she will have plenty of students to assist. She's energized and excited again, but the lack of leadership at her school and the infighting amongst staff made her feel worse than when she was in a corporation. Given the lack of profit motivation in education she found it difficult to champion change because she found little incentive for people to want to do anything above the minimum, as there was no point. Pay is low and differentiation for those who excel is not what you might expect in other fields. In fact, my wife's experience has been the opposite. They would pile extra responsibilities on staff without any change in pay, and since your contract is only for the given school year, people felt pressured to give in or not get renewed. For example, she has a colleague that has a long commute and therefore does not take on the "volunteer" tasks at the end of the day or after school. Her new contract requires her to be on bus duty every day and to run after school programs three out of five days. No other staff member is being told to do that as part of their contract. It is just a very sneaky way of pushing people out the door, once their pay and tenure get higher. All the teachers are appalled at how this one lady is being treated in the contract renewals but no one feels they can do anything.
We also have an "educator's dinner" that occurs every quarter or so, where teacher's and their spouses get together at someone's house to share war stories and support each other. Those in the public school who have a union to back them do not fare much better. I would have thought this type of manipulation and back stabbing would be more limited when the teacher's have a way to negotiate as a group, but alas the public school teachers ask the private school teachers if their lot is better and vice versa. Also, in all case of this group of about twenty teachers that I am a fly on the wall with every quarter, they all need to buy supplies for their classrooms out of their own pockets as there is never enough money, and this is for people getting paid below, often well below (my wife's starting salary was $32,000) $50,000. We tend to buy about $1-$2K of things on our own each year so her students get what they need.
I share this as all professions has an underbelly that is now always clear from the outside. I likely have no idea about the intricacies of law, other than some people who I know in the field grumbling here or there how only the partners enjoy life in a law practice and getting to that level is soul sucking. Just be aware, it seems education is also rife with dysfunction.
Moving back to career change, I will speak more from my perspective, but my wife's process was similar and it parallels what you have said. We both found the lack of flexibility in higher paying jobs to be more than we wanted to bear with regards to our time with our children and being able to let them be involved in activities or just see us regularly and not be thinking about work. I would work hard every day in my job as an IT exec only to get blamed or belittled by management and finding that I had to be connected 24x7. It made me pretty grumpy at times. It took me 3-5 years to get comfortable and determine what the things I did not like were and to find a way to use my existing skill set (not have to go get another degree). I already had a project management certification obtained while in the IT ranks. I just turned that into my primary job. My IT background is a massive asset to my employer as of the six PMs in my group, only two of us have IT background and our company sells and implements enterprise software. I have a hard time explaining the difference to people, so you may also listen to my story and furrow your brow, as when I talk to my dad each day he usually says, "Sound like a terrible day", when I share what occurred. I keep telling him that it was actually a great or at least perfectly acceptable day, because it was things that my job is about. A project manager's job is not about lack of stress, but it is not the stress of getting yelled at by your management for things that are not really your responsibility or things you should be doing, as is much more typical in IT. I do have upset customers because they are not getting what they want all the time, but I just manage their expectations, and do not take their ire personally, because it is not abut me. I do not get calls at night or on weekends. I'm sure during a go-live for a week or two, I may have to, but those are again, planned and sporadic, instead of unknown and constant. I've had two customer go live already in my short time here and no after hours work on my part was involved. I very much feel the "career change" was the best thing I have done. I can focus on other things I enjoy outside of work, and while at work, I feel very much in control and very empowered. Yes, the company I am at has a lot to do with that, but that is just finding a workplace that works with your personality and work style. That involves interviewing well and making sure you are not scared to ask the tough questions to flesh that out. I have lost jobs in that process, but they were clearly jobs I would have hated if I had just gone in blindly and hoped for the best. When the first question an interviewer asked was "Describe working too hard" was couple with the expectant look that they only answer they would accept was "No such thing" and their answer after I gave mine was "The last person we hired had the joy of working with me until 3 AM all week long the first week here", I know that's not the place for me.
So the best advice I can give if you go down this path, is now what you need to thrive and accept nothing less than that. Your short list of things you need, if compromised, is what is likely driving your sadness. I know that until I realized that, and stopped thinking I could grin and bear it, I kept foundering. It is not about finding a job a love, it is about finding a job that I can knock out of the park and going home each day knowing I did good work. One things I see lacking in education are people who are good administrators and organizers. As a lawyer I assume you have a lot of this as my wife and I did as project managers. One of the things that gets her noticed is this skill set because it is so glaringly lacking in most educators, yet crucial to really help your kids. This may help you stand out in that field, so keep that in mind. Sadly however, unless your state is different, but most are not, you will need to get some formal certifications if not outright degrees to move into any job in it. My wife's program was a $15,000 certification program remotely through SMU, but she's very limited in her options unless she bites the bullet and gets a Masters in Ed. She is working on that now, but only after she has spent 5 years in the field and knows for certain this is her "career". So perhaps that will help you paint your path with a little more insight.
Happy to share anything else you feel might help.