Well, poor people definitely are more likely to be black, and black people are more likely to be poor. (In the US, which is the country OP is talking about, and

Well, poor people definitely are more likely to be black, and black people are more likely to be poor. (In the US, which is the country OP is talking about, and in the UK, where I am, and in many other places, though maybe not everywhere.) Being black tends, for obvious reasons, to run in families. So race-associated poverty will do so too. Some other factors that tend to go along with poverty run in families, some not. There is some tendency for people to associate with others of the same race, and some tendency for people to associate with others of similar social class. It's not obvious to me whether being black is a better or a worse predictor of having poor friends and families than being poor is.