I would like to move with my 2 y.o. son to California from Philadelphia.

Lidia’s answer: You will need to follow the requirements of the Relocation Statute in PA:

http://www.legis.state.pa.us/cfdocs/legis/LI/consCheck.cfm?txtType=HTM&ttl=23&div=0&chpt=53&sctn=37&subsctn=0