I have to imagine that Flo's children have pursued the idea of securing royalties for themselves and most likely found that they have no recourse. Flo's release agreement with Motown was legally binding. She signed her rights to royalties away. I really don't think the girls have a legal legit claim to any royalty money. The only thing I could see them reaping the benefits of is any use of their mother's likeness, and I'm not familiar with exactly how that works in the legal sense.

Now morally, I think it's obvious that somebody should've reinstated Flo's rights to royalties the minute it made the rounds of the Motown circle that Flo's daughters were in a bad financial situation back in the 90s. I know I shouldn't be, but I'm always amazed at the lack of people's interest in doing the right thing.