If he is legally the father he has a chance, of course. It's up to the judge. He has to petition the court for custody.
Yes. see link
Her mother
that depends on if the mother has custody over her daughter or not. It also depends on how old the daughter is. If she is under the legal age limit, then the mother is still responsible and makes all decisions for her. If the mother does not have full custody over the daughter, then the mother and the father of that child must come to an agreement on the living whereabouts of the daughter. If the mother has legal custody over the daughter and the daughter is not of legal age yet, then yes, the mother can bring the daughter over too.
For 1) are you in custody of your daughter? If you are in full custody you could take her to court for kidnapping is your EX mother in law in custody of your daughter? Do you have joint custody? If your ex mother in law has no custody over your daughter you could take her to court, she is not authorized to take care of your child.
She would be your cousin.
the father gets the custody of the child if the mother dies
The mother. If she dies, her parents get custody.
Yes. The child is your baby. As long as your a fit mother the child cannot be taken away from you. If you are a minor, your parents still have custody of you, but you have custody of your child.
Preparesee links
you get it for her.
The mother assumes automatic custody, unless she is unfit.
If both parents agree to that he should have custody, yes. The parents decide where she will live until she is 18yo. If this is a permanent solution they have to go to court and change custody and the child support order so it's paid to the father. Many parents and teens clash during the teen years and sometimes it's good to have some time apart. Get a perspective on things.