I'm 65 years old, and all my life I thought my father was my biological father. A year ago I find out he wasn't. I researched and found my biological father. He has passed but was a very well-to-do man. Should I introduce myself to his family?

It is your choice, do what your heart tells you to. If they don't accept you then don't cry over spilled milk. They weren't in your life to begin with, let them know what they are missing. But, I would start off by writing them a letter. Make sure to not come off too strong. Go along the lines of "Hello! My name is (your name) and I believe that (biological father's name) was my father." Tell them when you were born, your mother's name, or anything that might help them believe you. Then end the letter by saying, "I do hope you will write me back as I would love to get to know you. Sincerely, (Your name and return address)."