Please don't do this - but from experience of European "holiday" airports, I bet if anyone waved a Philippine passport at the bored looking guy with a Super Mario moustache, but walked through the EU arrivals line, you'd just be able to walk through
So ok I'm going by experience in certain Spanish arrivals, but hey.

There's certainly examples of people who have picked up their siblings passports and nobody has noticed/cared.

I don't know, lazy Sunday morning, my mind is wandering, oooh look a kitty