popa_bar_abba-
Here’s what some friends of mine do; they daven at the 7:00 minyan and then bring their kids to the 9:00 minyan and daven with them. They stay there with them as long as they last and then bring them home.
My son is too young for that but I do bring him to Maariv sometimes (he can sit still for 20 minutes or so) as he loves saying Shema out loud during davening.