Being a SAHM means you are contributing a huge amount to your family, with all your at-home work supporting your family's lives. Society still undervalues this, and the default is to not have a will and not have life and disability insurance if you are not bringing in an income. But your loss would be a huge financial as well as emotional hit for your family. Plan for it.
So 3 things to look after:
First, lawyers tend not to charge a lot for wills, and often do a 2 for 1 deal - i.e. your husband needs a will, power of attorney, etc. as well. Does he have one? He may not be facing surgery, but he could get hit by a truck on the way home from work tomorrow. A family law specialist will know the laws where you live, and will ask all the important what-if questions you probably haven't thought of. Not doing this would be penny-wise, pound foolish, IMO. Plus even if your husband is the beneficiary for your life insurance and you have no other assets, you both need wills in case you die together in an accident. What would happen to the children and the estate then?
Second - do you have disability insurance? From the description of what you do, you (your family) need it. If you were totally disabled, your husband would need the income to hire someone to do what you do now. Since he has decent coverage at work and has the life insurance for you, can he get you covered for disability as well?
Third - since you have life insurance, then your husband has the resources to hire help if you are gone. However, if you think he would not do things the way you would want them done, then you can always have someone else be the executor or co-executor of your will, so that the money is spent the way you want. Again a good family lawyer can help you sort this out. This may also mean changing the beneficiary of the insurance from your spouse to your estate (or whatever the lawyer advises for your area).
I'm not a lawyer, none in the family, but after reading the inheritance drama thread over on the anti-mustachian forum I am even more strongly in favour of clear, well-thought-out wills.