That is straight up INCEST.
Some might feel "genetic attraction," but as adults one has to make choices on what they proceed to do- and dating her son is illegal in most states, and disgusting.
Just because a person "feels" something doesn't mean they have to pursue it.
The people involved are going "public" for the fame and money. Not for the cause. Otherwise they wouldn't be pitching it to news stories and would instead create a non-profit counseling organization that helps people deal with, and IGNORE, their INCESTual attraction.
Sick, appalling, and wrong- and, in much of the world, illegal. Dating a 3rd cousin very detached is one thing, but dating yoru own child is disgusting, horrifying, and illegal. They shouldn't seek "acceptance," they should seek counseling for their illegal, unethical, and revolving behavior. Dating your adult child is NOT OK. It's absolutely disgusting. And illegal in most of the world.