I’m trying to remember an illustrated hardcover book probably under 30 pages. If I had to guess I would have read this around 1989 and I’m thinking it was already a few years old at this point but not sure. If I remember correctly it was the story about two boys during summer I would guess set in the 1960’s but don’t quote me on that, reminiscing about the things they did. I remember them drinking pink lemonade with one of the boys grandfathers and walking to either a pool or a beach with rolled up towels under their arms to go swimming. I’m not too sure but I feel like one of them had trouble swimming but can’t remember anymore that that. It was pretty colorful and had a nice art style.
My teacher, in either elementary or middle school, read a book to our class about siblings who went to their grandmothers (or aunt’s) house to live for the summer. If I recall, one of the siblings, maybe the girl didn’t want to go. They play outside in the gardens and orchard and end up trying to solve a mystery which ends up having to do with a dollhouse.