How can a stepfather adopt a child?
The biological father have to give up his parental rights in order for you to adopt.
After a child is legally adopted by his stepfather can a biological father claim any rights to the child?
How will a family who adopt a child from another language deal with the issue of multiple languages in the same family?
Can a stepfather adopt his wife's child without consent of child's father if he has not paid child support?
Each state has its own adoption laws. You will need to check with a lawyer concerning your local law. I know of one case where the father did not pay child support. The lawyer had the court declare the child abandoned by the father. Then adoption proceedings began. After the adoption became final, the birth father appeared. He could do nothing.