A fond formative memory of mine.
My parents used to have some friends who had also had children the same ages as myself and my older sister. Every few months we'd go over to their house. Our parents would go out for dinner, and us teenagers would stop in to watch videos, eat sweets etc.
Later on, my sister went off to university, as did the older son of this couple, leaving just me and their daughter of the same age. At the time, we were into playing video games, so we spent hours doing that. Their daughter used to love that original 2 player mario brothers game, and couldn't stop