My advice is to get on as originally planned and not cancel the trip, its been 4years, this trip is long overdue,
besides, the entire philippines is not malaria-infested i suppose, only certain areas.....
I understand your husband is getting a bit paranoid but he's probably just worried about the safety of everyone specially your 2 kids,
anyway, to assure him and for his peace of mind, look up to the philippine health advisory guide,
so you know where to be careful and what places in and around philippines you should not go....
and anti-malaria shots or tablets would help and some off lotion as maria just said.....
Its best to take all the necessary precautions to be sure.....