What's your wifes reason why she would like to bring your son to the Phils? Is't just for vacation or permanent stay?
Im sure you still have right to disagree to your wifes decision as you're both still married? WHy not make an agreement between you and your wife for taking turn looking after the son (if not living together), instead of taking him away from any of you. SHe has ILR so Im sure there's no reason for her to go back to PHils for good, that means she can stay in the UK as long as she wanted to.
You're BOTH can claim to any benefits as long you're entitled, this depends on your both income.
Myy advice is to go to Citizen Advice Bureau for free advice and that's including benefits you both could be entitled whether you're both living together or separeted.
Goodluck!![]()