The main issue I have with RegalHood is if Tamara is RH’s daughter, then Tamara and Neal’s relationship would take on a squicky factor. Tamara was sleeping with Neal, she was going to marry him and then could have potentially given birth to his child.
If RegalHood happened, Tamara would be Henry’s step-sister, who slept with his father, would have become Henry’s step-mother and could have given birth to his half-sibling.