That dad is a horrible adoptive parent. You NEED to tell your damn child as soon as you can their story or they'll just feel betrayed and alienated later on. And, if she can play through Portal 2 she knows what the hell adoption is and that she doesn't look like her parents.
The Internet persona known as Cena_mark has already posted multiple similar attempts at human contact under the other Portal 2 controversy videos. It's the same poorly constructed joke. Please ignore both.
Portal 2 and all that aside, this might be the stupidest news story I've ever seen. About half of it is people telling the news team that they shouldn't be doing what they're currently doing, and that they're wasting their own time.