Just sold father's home, 2 siblings will not respond to attorney to receive their share. Will not return calls or respond to mail.

First sibling indicated that she doesn't want to be bother the first time a lawyer called. She doesn't answer her phone and when she does she states, "Wrong number." Second sibling doesn't respond at all as well. Both siblings did not attend father's funeral and were not part of his life. Just sold father's home. What happens to their share from the sale of the home? Do I place an ad in the paper and wait for them to claim their share?