> I want single moms to not worry about that stuff either

Uh, that's like 20% of households with children, or 25% of children (plus another 5% are raised by some other guardian, so likely also a welfare situation). That's again where we're getting into unrealistic territory (not to mention the terrible incentive). Across all of your groups, you're basically saying half the population should be taken care of by the other half.

A more pressing issue is why are a quarter of children raised by single parents? Even if they were completely taken care of economically, that's still a disaster.