I have recently discovered that I have three siblings, the only
information I can find is info on my biological father. How can I find
out the names and contact information of these three siblings?

If you know the city and state where the biological father lived,
visit the website www.rootsweb.com and post your query to the message
board for that particular county so that a local or national
genealogist can do the research for you.  How reliable is the
information that you have 3 siblings?  Did that person furnish you
with their names (don't mention the names in your response) or any
other information such as estimated dates of birth that might help you
identify and locate them?

SINCERELY,
4KEITH (I'm NOT a GOOGLE Researcher)