What is the name of your state (only U.S. law)? Alabama
My 21 year old sister has a 1 month old she doesn't want. The baby's father is not in his life. My husband and I want to adopt him, what do we need to do in order to make this happen?
Have you thought about WHY the presumptive father is not in the child's life? Does she even know who he is? Does he know about the child? Has he stated that he wants nothing to do with the child? The LAST thing you want to happen is to start the adoption process, and then find out that the dad who never knew about his child suddenly appears and asserts his parental rights.
While the mom will probably voluntarily sign to terminate her parental rights to the child, you need to make a concerned effort to identify, find, and have the father sign off on the deal as well. Unless and until the presumptive father terminates his own parental rights, you CANNOT legally adopt the child.
I would suggest hiring a good adoption attorney to assist you with this.