To be honest, after reading about greasy here, if I had a kid with mobius, I'd be tempted to drop it down a well and try for a winner. Learn from your own mistakes and the mistakes of others.Giving up a child is one of the hardest things most parents would ever do. And I can expect that Russ' bio Mom & Dad didn't just take one look at him and say, "ewwww! We don't want to raise a mutant baby! We'll keep the good one and give this one away."
It probably took them a while to come to terms with this and realize they weren't able to give him the care that would be necessary while also caring for another child. And like it or not, I'm sure that his adopted parents actually took him in with the best of intentions and loved him anyway.