Philip was the son of Demetrius II of Macedon, and either Phthia of Macedon or Chryseis. Philip was nine years old when his father died in 229 BC. His elder paternal half-sister was Apama III. Philip's great-uncle, Antigonus III Doson, administered the kingdom as regent and then king until his death in 221 BC when Philip was seventeen years old (Plb. 4.2.5, 4.5.3-4; Just. 28.4.16, 29.1.1).
Philip was the son of Demetrius II of Macedon and either Phthia of Macedon or Chryseis Philip was nine years old when his father died in 229 BC His elder paternal half-sister was Apama III Philip's great-uncle Antigonus III Doson administered the kingdom as regent and then king until his death in 221 BC when Philip was seventeen years old (Plb 425 453-4; Just 28416 2911)