@NiceGerbil
The MONEY is the problem. There is no intrinsic issue with single parent families or ones with SAHM.
Yes single parent families are more likely to be in poverty. But it is the MONEY that is the problem. Not the nature of the family.
Your solution is... What? How do you intend to reduce the number of single parent families in certain groups? The government are going to have a think. I can't even think of what the solution might be. What are your thoughts?
(Seeing as it's the family structure that's the main problem, and everything else flows from that).
Where do you think people get money? They get it from jobs.
If is a causal chain here, just because you feel uncomfortable saying that some family structures bring in more money than others doesn't change that. I live in a one income family, or close to it - I am pretty comfortable with the fact that it affects our monetary situation.
There are any number of possibilities for intervention, especially given that there are several different problems mentioned. A really simple one might be to try and improve the situation of low income families generally, there are a number of possibilities that could work and it would have the very excellent effect that it would not need to be targeted at any particular ethnic group - it would help the poor in all.
Some people would suggest encouraging women in families where they stay home to work, and there might be some ways to do that though on the other hand, perhaps they would prefer not to.
You could look at institutional social spending in terms of things like community infrastructure which would be most helpful for children with fewer resources at home.
In some cases we might ask if the disparity is important. Is it really a bad thing if one group tends to have a cultural appreciation for working in building trades while another one admires bankers, so long as both have a decent standard of living? What do the people in question think?
As far as single parent households, that would probably be a good thing to try and minimise, because it seems to not be only an economic issue. Parenting alone is not great.
As for why some communities have more of those households, I am not sure anyone really knows. You can look at the stats on the increase in households of that type across demographics and they are in some ways suggestive - in the US for example there were always more single parent families in the black community from early on, very likely the legacy of slavery and family disruption. In the 60s there was a sharp increase among whites and blacks but much more in the black community (and I believe that s still true if you take class out of it but I may be misremembering that.) Maybe it's the legacy of what came earlier, or to do with other social change. Values and cultural practices in a community are passed on over time in many cases, they become encultured, and that is true whether they are useful or non-useful.
As to how to fix it, maybe that isn't something that can be done by the state? Lowry, who I mentioned earlier, takes the position that this is something for the black community to tackle within itself, as it isn't about things that can be socially engineered. Certainly there are people within that community who would like to see that happen.