Locating bio father.. do or don't?

need advice! long story short i slept with a man in the navy. then made back up with my boyfriend (my now husband) got pregnant. man in navy said theres no chance in it being his b/c he got "fixed " after 3rd child. i tell him if there was a chance in my child being his that i was not going to have it (i wasnt going to have an abortion i just wanted to get the truth out of him if he lied to me about getting "fixed") i have my child and had DNA test with husband. NOT HIS! i look for 3 years trying to find the man in the navy. everytime i found him i was avoided. i then find his WIFE on facebook somehow by luck! there i see he has a child 6 MONTHS YOUNGER than my child. THUS HES NOT "FIXED". from his wife's page i found his dad, step-mom, and sister. i send ALL of them a message telling them the situation and that i wouldn't be contacting them if i did't know FOR A FACT that he was my child's father. i get NO RESPONSE FROM ANY OF THEM except his sister. all i get from her is i have to deal with him about that matter. she couldn't even give me a number to reach him at. he has not tried to contact me or even show he is concerned to find out if i really am telling the truth! he has known from the day i got pregnant that i was pregnant and it could be his. i even call a number i had of his and was told he was no longer in the navy. BUT that number is located in columbus where the navy base is AND he LIVE'S in columbus! common sense says he is the one who told me he wasn't in the navy anymore. PLUS i found pictures on his dads page of him STILL in the navy sooo my question is... if i take him to court to get child support and prove he is the father what are the odds that he will try to take my child from me? do you think he would even put in the effort to see my child since he is in columbus MS and im down by gulf shores AL...he has a baby. i just dont want to prove to him that HE IS HIS SON and then me hate for ever finding him. i need the financial help. i have no job and living with my mom at the moment and she is supporting us. but since he is in the navy, married, and has a child already...would he be more of a better provider parent to my son that i am and thus leave me with having to visit my only child on HIS terms??my son has been in my life every day of his life. he is my world and i am his. i just dont want to make a mistake by trying to get money. also if he decides to sign away his rights, will he still have to pay something? im just trying to do right by my son. my mom doesnt want me to find his father b/c of what COULD happen, BUT he is his father and deserves that chance, just seems like he don't even want that chance. WHAT SHOULD I DO!!!!???? i have got no help from any family members in his family NOTHING all i asked wanted to know what health things that run in their family that i need to know about for my sons future and i couldnt get that. i do know he has 3 older daughters and 1 younger son which means he now has 5 kids. 2 of them his ex-wife left with and they havent seen them in 3 years, he has a 14 year old girl who he see (i saw the pictures) and 1 little boy with his wife. what i want to happen is take him to court, him sign his rights away so my son can have a real father and be able to change his last name, and be done with WHERES WALDO! i dont want him to be able to pop up in 20 years and say YOUR MY SON or I NEVER KNEW ABOUT YOU. but since hes in the navy i want my son to have what he deserves in life and know where he came from....WHAT WOULD YOU DO?? any feedback will be much appreciated thank you so very much!!