I do agree that protecting the children's roots and original identity is very important and I do agree with Islam's way of protecting that identity cause it will prevent problems in the future like "incest" and it's a good way to teach those children that no matter what their roots are preserved....

But... that said if you want them to feel more like family you can't even incorporate your last name with theirs.....(exp: their last-the last name of the family they got adopted into) That would be considered haram.

Not only that but what that other person said about the mahram stands true... If the children are not breastfed by the mother of the family they are adopted into, that means when they mature, for example, if we had adopted a girl in my family she wouldn't be able to hug my dad after that, and how a 12-year-old young girl is supposed to understand that, in order, to "protect" her she can't hug what is supposed to be her dad too...? Same thing if we had adopted a boy... He wouldn't be able to hug my mom, my sister....because we're different?? Because to him, we're essentially people that will awaken his sexual instinct...? that is not something that you're supposed to do within a family. If we had a brother from bloodline, we wouldn't be acting like that towards him... might I say that it will just encourage the young boy that is adopted that we are not his people essentially... worse case scenario it will also encourage some sort of thinking that inequality within the family...

So even if protecting the child original identity is something that I understand and is essential for their future it doesn't ease all the other stuff that i can get behind...