I agree with the advice to stick to the investment order.
Re the car, if you live in a bikeable area, consider holding off and see how it works. We are 2 adults with 2 kids at two different schools (neither provides transportation) with multiple days a week of activities each. I work full time from the office and I have to drive for work sometimes. My spouse works full time from home. It is a bit of a puzzle to make things work, and someone has to bike in the rain or take Lyft occasionally, but even with the Lyfts, it’s still far less expensive than owning a second car. Also far less headache - one less car to smog and register, one less car to take to the shop, one less thing in my life to maintain.
Not having a second car also forces you to talk to the other families and try to work out carpool & bike pool situations. Getting into a good carpool / bike pool swap is good for everyone.