Do you recognize your own bias?
This is what we do know as undisputed facts.
1) This woman wants to follow her boyfriend.
2) To do this, this woman wants to separate her son from a man that she considers the boy's father. More importantly this man and this kid have a relationship and the kid considers this man to be his father.
3) This woman is considering dragging the father into court to be able to be with her love interest.
This is the reason I am calling bullshit on the whole thing. You don't separate your kid from his father because of your dating life. That is what this woman admits she is doing here.
Clearly the father has some sort of custody, or the mother would be making plans to move already. Clearly the father has the weekends, and clearly the mother isn't happy about this. Clearly the father wants to be a part of the kids life, and clearly the mother doesn't approve of his actions (for whatever reason). And clearly the mother isn't happy with this man's involvement, it is logical to assume that if paternity were an issue, the mother would have taken advantage of it by now.
Come on! She is saying he is "trying to buy the kids affection". That attack doesn't even make sense. Even as she is attacking the father, she is admitting that he wants a relationship with his son.
My basic point is correct. A child has two parents, and both of them have a responsibility to cooperate. I would say this to a father in this situation the same as I would say this to a mother.
It doesn't make any sense for you to take this position, especially since now you are claiming that you can't know what is really going on. That is why I suspected that were the genders reversed, you might have taken the other side.
I feel very confident saying this. A responsible parent does everything possible to cooperate with the other parent involved.
Dragging your co-parent into court so that you can chase after a romantic interest isn't reasonable under any circumstances.