The more I read, the more quirks and foibles I remember!
DMIL always presents us with an "inbox" (she actually calls it that) of interesting newspaper and magazine clippings. She used to post them to us, so I guess saving them up for our visits is an improvement.
DF's hobby is Garbage. He has elevated it to an art form. He spends several happy hours a day emptying the bins (there is at least one in every room), sorting the rubbish, folding card and paper, rinsing tins/bottles, organising the compost, allocating all to the outside bins, etc. As soon as you dare put something in the kitchen bin, he is there, his Spidey Sense Garbage Radar having gone off and he comes running. There are three different bags (all recycled plastic bags of course) housed within the one small plastic kitchen bin. My lovely shiny Brabantia he looks at with suspicion. How can the garbage be properly organised in such a large, unwieldy, flashy bin??
He fishes out the offending piece of rubbish, examines it, then reverently places it in the correct bag, e.g. Wet/dry/other, or the recycling bag for paper, or the recycling bag for card, or the recycling tray for plastic (foil) or plastic (hard), or the box next to the bin used for tins, or the other box for small clear glass bottles..... you get the idea.
Don't even get me started on the routine for bin collection day, or garden waste. The mind boggles.