I have 2 card holders that are mostly full of cards that the children have got from their friends at school.
When the holders are full the cards just get put in a pile on the window sill. The same goes for those stupid, flimsy, papery cards that won't stand up.
Family cards get put on the mantelpiece.

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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.