Do adopted daughters get on with their adopted mothers?

My adoptive mother is exactly the same. She has an identical twin sister who is not that way at all and seemed to be much more relaxed and free with praise for her sons (my cousins). I think it's just personality, not necessarily adoption vs non-adoption. Some mothers aren't cuddly and don't offer praise and many basically act like things like putting a roof over your head and food on the table is the be all and end all of parenting and showing love. That love can be assumed even if it's never spoken aloud. It's a miserable thing and incredibly hurtful for the children raised in these households. There's really nothing that ever takes that away, I think we just learn not to let it rule us after a certain point. And most of all, not to take it personally. It's not you. It's absolutely a problem within herself that often does stem back to their own childhoods and how they were raised and they just choose not to try better (I don't buy that anyone is 'too old to learn/change') with their own children.