I had an affair 5 years ago, and she was marry at that time - but i did not know it. know she she is comming and and say that she have child from me and she want child support. The child know is 4 years old and she got divorce when he was 2 . no one is wrriting as tje child father in the birth certificate . do i need to pay / dows it change to the amount of the child support that the child was born at the time she was married ?