I just wanted to highly recommend doing Ancestry DNA or 23 and Me if you have any doubts about paternity/maternity.
Ever since high school science when we learned that it is virtually impossible for two blue eyed parents to have a brown eyed baby my brother and I have questioned his paternity. Our mother vehemently denied that this was possible and said that it happens all of the time and that my brother looks just like our dad and his side of the family. At University my brother started to do more research and realized that it is pretty much impossible for him to be the product of our very blue eyed parents. The researcher he spoke to said he has never seen it happen in his 40 year career. He did Ancestry and all was revealed.
This was also important to him because he has a medical issue that is genetic but no one on either side has it. He says it was the best money he ever spent. He found his biological father through cousins who matched with him. Things are a bit of mess but are getting better. He has joined a few support groups we found online for people who had the same outcome. The holidays are going to be very interesting at our house this year.