The toilet seat thing has always puzzled me too.
I can't understand why some make such a fuss...........up, down, what's it matter?
If you want it down just put it down, it's hardly a cross country run is it?
As for the brothers/sisters thing I haven't got any experience as I am an only child.
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Old aunts used to come up to me at weddings, poking me in the ribs, cackling and telling me
'You'll be next.' They stopped when I started doing the same to them at funerals.