If you are serious, then use all lines that you can use.
If they do not want to be contacted, they will tell you as such.
But, many times they are lost and are very happy to hear what is going on and maybe want to do things as send money or find out they are near other Members!
Ergo:
Looked for a Brother for years and found him in the KC area! When He was found, He was tickled to death and has been involved for two years now!
Oh, this is after @ 40 Years since he was lost!