Help! I had managed to purchase the pool, lawn furniture and barbecue grill for my little family and today they're all gone, as well as the trophies. I think that the pool was purchased for the first generation, but the second generation bought the other items.

Are these items still checked in the store, to show that they have been bought?

No, there is nothing to indicate that they were ever purchased, except that I saw the swimming pool in the lower left of the screen, with the table and chairs slightly above the pool and the barbecue grill on the deck.

Do you have other slots open? If so, it is possible the purchases were in one of the other slots.

I have never heard of purchases disappearing.

No, House upgrades are not placed in the slots to the left of the screen after purchase. all of these items were automatically placed in the screen, as I described, in my first post.