At Ask Me Help Desk you can ask questions in any topic and have them
answered for free by our experts. To ask questions or participate in
answering them you must register for a free account. By registering you
will be able to:
Get free answers from experts in any of our 300+
topics.
Your son's father can not let any one else file his baby unless that some one else had the custody of the baby.
You can not find out who is that person. Even IRS will not disclose this.
However, while the IRS will not notify you who claimed the child as a dependent, they WILL take action against the miscreant if you tell them that only your or the child's father is allowed to claim the child as a dependent.