In my family, we would always kneel down together and pray at the end of the day too. We said an Act of Contrition, Hail Mary, Our Father, and the Guardian Angel prayer.
We also added in our own prayer of blessing important people that my parents decided would be good. Growing up this was a great prayer because it was a special bond that we made. It was really simple, and said, “God Bless Catherine, Thomas, Anna, Maria, etc…” all the way through all sibling, parents, grandparents, and godparents. We ended with 'Holy Family watch over us, guide us, and protect us." I really liked this one growing up especially because whenever a new sibling was coming (I’m the oldest of 8) we would also bless the new baby and because it was a great way to learn a very basic way of how to pray for other people.
Hope this helps!