My ex and his wife have a combined 4 kids [2 hers, 1 his, and 1 theirs together]. I just found out that from my son, that 2 of the kids have to share a seatbelt [they have a 5 seater]. When I told my ex about this, he denied it, like he does everything. My son would never lie to me about something like this. I asked my son if the other 3 were in the car when he was dropped off [they live 30 - 45 minutes away], he said yes. And I believed him because both my ex and his wife were in the car.
What would you do?