Hi- I have not spoke to my Biological fatheer in some time. I am 36 years old. I got a call that he had a stroke . I am not sure that he is "official

I'm not sure you can check anywhere to determine whether or not he is "legally" married other than the State offices in Trenton that record marriage certificates, but I don't know if you can get access to his records.  Do you know the county in which he lives?  Start by doing some property searches on line at the county board of taxation, call the county registrar of deeds, vital statistics, etc.  Even if he is legally married, his second wife is not entitled to his entire estate if he dies without a will.  If he does die, you can stop anything from happening with his estate by filing something called a caveat in the county in which he lives.