can a mother sue the father of her child who refused to take a paternity test 21 years ago, but has decided that he wants to take the test now.

21 years ago, my child's father refused a paternity test because he didn't want to take responsibility for my son, and because he didn't want to compromise his wedding plans with his soon to be wife. a few weeks ago, he has decided that he wants to take the test, because it's a secret that he thought his family and wife's family would never find out about. I filled out paperwork to be served to the father 18 years ago but whatever dad did, the paperwork was never served to him, and he said some things to me that made me afraid to pursue, so I left it alone until a couple of weeks ago when the father was desperately trying to contact me through Facebook.