they should because the stepfather is the dad not the bio father
A birth father is a genetic father of a child, as opposed to an adoptive father or stepfather.
now a stepfather can't adopt a child without the concent of the child's father
If you're asking who the baby is to the one who gave birth to it, the baby is the child of the half sister, making her the baby's mother. As for the stepfather, he would be the child's father and step grandfather. But if he and the half sister's mother divorce, then he would no longer be the child's step grandfather. But he would, of course, still be the baby's father.
If the birth father has paid no support and has had no contact with the child for one year, the stepfather may adopt in most states without permission of the birth father. However, this is still a legal process that requires a lawyer and court documents. The price can still range from $500 to $2000. In PA you can't put a father on the birth certificate at birth unless he signs for it and fills out a admission of paternity (if mother is unwed). If he is not listed on the birth certificate he has no legal rights and you don't have to ask him for anything. Especially if he cannot prove he was there or active. And if you went to domestic relations for paternity/support and he didn't show or pay it's an admission and most likely be seen as "turning over" his rights.
No, only the mother can. On the reverse, should the father be able to sue the stepfather for aiding the mother in alienation the child from the father?
In general, no.
It seems there might be a misunderstanding in the question. If you meant to ask whether a stepfather can take the place of a biological father, the answer is that while a stepfather can play a significant role in a child's life, he cannot replace the biological father emotionally or legally in many contexts. The relationship dynamics can vary greatly depending on individual circumstances and the feelings of all involved. Ultimately, the bond formed between a stepfather and a child can be meaningful and impactful, even if it differs from that of a biological father.
Possibly
Approved by the court
No, that is simply silly
Get over it..the kid doesnt want you!
No unless he adopted the child no