What is a free website that can help you find someone in your family?

[Veronica Alicia]

Your question isn't very clear about the subject of your search - if it is genealogy or a lost living family member.
Suggestions have been given about the former, so if you are looking for a living person, you could try "Friends Reunited" (free) "Facebook" (free), "123people" (free), 192.com if in the UK for a possible telephone number - they will make a charge if you want info from the Electoral Roll, like an address.
The Salvation Army will also do a search for living relatives (they make a small charge) www2.salvationarmy.org
If in the UK , you could find someone who has a copy of the Electoral Roll on their computer and ask them to look up your cousin, Joe D. Bloggs from Liverpool, for example. The published roll is only 80% complete, but that is often a successful tool