I am 44 years old and have found my birthmother she said that there were 2 men that could be my father. I found1 and did DNA test, negative. The other man had passed away when my mother was 4 months pregnant with me. There a many physical traits that resemble myself through this mans pictures, but his mom is still alive she is 98 years old and I am getting ready to meet her for the first time. I was wondering if anyone is familar with DNA testing of grandmother and how accurate it would be? I have looked into this and get feedback both way negative and positive. Also, any suggestions as to confirmation of this man being my father. Help?