Hmmm, let's see:
Oldest sister would definitely shoot digital. She'd wipe the screen and lens after every single shot to make sure there were never any smudges, and her bag would be spotless.
Next sister would also have the latest digital body with every gadget she could get for it. The problem is that she'd often lose those gadgets. Half her pictures would be accidental exposures, but the ones she did on purpose would be pretty good.
Brother would shoot film as well as digital and would tinker with all the cameras to fix or improve them. He'd probably take architectural and car shots.
Next sister would shoot whatever camera comes in fashion colors and would have lots of animal and flower shots. She'd get a lot of likes on social media.
My father always liked mechanically oddball things, so he and I would share the Polaroid. He just might have built his own 8x10 view camera as well, which would look horribly jury-rigged, but would be as solid as hell and technically sound.
My mother would have a point and shoot, she'd constantly confuse the on-off button for the shutter button, she'd never delete anything, and would spend most of her time telling the rest of us what we were doing wrong.
Edit: Ah yes, the dinner conversation. Portuguese family dinners are long and chaotic, and the wine flows freely, so it's anybody's guess what the conversation would be like regardless of our photography habits