Philip was the only one of the descendants of Antigonus who put a son to death.
Edition :
Plutarch. Plutarch's Lives. with an English Translation by. Bernadotte Perrin. Cambridge, MA. Harvard University Press. London. William Heinemann Ltd. 1920. 9.
Remark :
thirdperson: Perseus is not mentioned in this text, but he is the one telling Philip about his brother's plans. context: Philip executes his son because his other son Perseus told him about a conspiracy: Demetrius wanted to use the Romans to overthrow his father and make him king instead.
This and the details are taken from the New Pauly.
http://referenceworks.brillonline.com/entries/brill-s-new-pauly/philippus-brill110000