No
If he is married to the child's mother the decision is theirs to make, but if he is not married to her the mother decides the child's last name.
Child support is paid until the children are 18.
That depends on the age of the child. It would require a next change request, but yes you can. Talk to your local records office (generally in the city hall) about the steps neccessary.
Yes they are planning on getting married and having many childs
NO.
It isn't the birth father, no one will ever change the childs birth father, but he will legally be the step father,until the divorce comes through.
Julia Child's birth name was Julia McWilliams. Child was her married name.
If the court has said you are to pay child support, your marital status does not matter.
Childs Frick died in 1965.
Amy Childs's birth name is Amy Andrea Childs.
Gilbert Childs's birth name is Gilbert Jefferies Childs.
Martin Childs's birth name is Martin David William Childs.