Fox Rothschild is expanding its California family law practice with a new acquisition, marking its fourth merger this year.

The Philadelphia-based Am Law 100 firm has merged with five-lawyer Apex Family Law, the firms announced Monday. The combination went into effect Dec. 3. Raquel Sefton, Casey McNamara and Christopher “Craig” Bridwell joined Fox Rothschild as partners. Joining with them are associates Carlos Ramirez and Sarah Thompson, as well as five professional staff members.