Hello,Welcome to our site and thanks for your question. My name is ***** ***** I will do whatever I can to try to help you.
If they are still alive, or they have brothers or sisters, you can always ask them.
Do you know where they were born?
Most states will search for birth certificates for a parent if the child requests one. There is always a fee, of course, which varies by state. Many other countries will do this as well.