I don't believe it is selfish to want to raise your child that was wrongfully taken away from you and not returned.
There's nothing wrong with wanting the child -- many loving parents give up their children for adoption and miss them -- but what is BEST for the CHILD? Too many adults do things regarding children for selfish reasons. They didn't begin trying to get the child back until she was 2 which is old enough to cause damage to her. They actually signed away their rights and then later claimed they misunderstood (which is another reason to question why people come to a country in which they don't understand the language, but that's another thread), not to mention they are illegal immigrants. If the Hes think this child is not going to be permanently negatively affected, they've got a huge surprise ahead of them. I wouldn't be surprised if they change their minds a few months down the road after the child continually cries and begs for the only parents she's ever known. She's not a baby, she's 8 years old.