[nikkianni]

Speaking as an adoptive mom who, like another poster, wanted a baby more than anything else in the world, don't sign those papers when you aren't sure of what you're doing.
Being family, I know it makes things even more complicated, but your daughter is family too. And if what you truly want is to keep her, then that is what you should do.
It may hurt your family, but families have a way of healing over time. Even when you think it can never happen.
As for having to pay them back, usually you do not unless there is some type of signed agreement involved. It would probably be best to consult your attorney on that issue.