https://i.imgur.com/57F8zUi.png I've just been playing a three-day Winterfest in my BACC game. The household I'm playing has three toddlers (I must be mad) and the two adults, so it got quite busy....
I always always keep my presents and put them somewhere in the house, even if they make no sense or end up in a cupboard, because it feels realistic, and I'm already too quick to sell whatever I find in my sims' inventories. I try to keep each person's gifts in their rooms if I have a large household and like you, I start to build their personality around those odd items.