Which expansion should I get, personal recommendations

For EP, I would recommend the Seasons. It's a game changer. I'm pretty sure your Sims will appreciate it. It comes with a calendar & holidays. It's a great addition for family player. Or you might want to consider the Get Together. It comes with a beautiful world & the club system (it's a pretty neat system for family player because you can group your extended family in the club then invites them over for any occasions or events that you're going to plan.