Hello Dr. Reames! I'm having a hard Iliad brainrot this last mounth leading to an absurd fall into the Alexander the Great rabbithole and I was wondering, do we have any records or anything that Philip also took his others sons on the roads and/or battlefields with him, or was Alexander the only one?
Philip only had one other son, Arrhidaios, who was mentally infirm. So it's unlikely he went into battle. Alexander didn't take him into battle either.
That said, if Polyaenus can be believed, Philip DID take his warrior daughter, Kynanna, into combat, at least when fighting Illyrians. Polyaenus tells us that she did single combat with and Illyrian queen and beat her. This could be later invention--at least about the winning in combat part--but we know Illyrian women fought and that Audata, Philip's first (or second) wife trained her daughter--that same Kynanna--in military matters, as Kynanna in turn trained HER daughter, Hadea Eurydike. Eurydike turned up at least once dressed in armor at the head of her Macedonian army, when she faced off with Olympias leading Epirote troops.
Also, when Perdikkas's brother, Alketas, murdered Kynanna in order to prevent her from marrying Hadea (Eurydike) to Arrhiadaios, the army stepped in and forced Alketas to allow the marriage anyway. The text doesn't stay, but it may have been out of their respect for Kynanna, beside whom they'd fought in the past.