You don’t have to say a word. Just continue to do what you do for him. Your son will see who is there for him on his own and when he is old enough and wants to search for his father he can ask his father why he was never there. My son father hasn’t been in his life. When he him my son asked what his name was and he didn’t say I’m your dad he said you can call me Deron. I never speak of him and if he comes up i never speak mean of him. My son knows who was here for him and who wasn’t and I didn’t have to bad mouth the father for him to know this. One day my son will want to seek and ask questions and that will be the ball game rt there. He can never say I talked bad about his father!