I am a SAHM without insurance. Are you worried that if you die, DH won't have the money to hire a nanny with his salary? If that is not that case, I'd just make sure that DH is well insured because it is probably cheaper to increase his coverage than to get separate coverage for you. In the unlikely event that you both die, his insurance would provide for your children.
I don't see much point in getting insurance for me. It is costly, we have a lot in savings, and DH makes enough that he could hire a nanny, or 3, if I died.