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, and my son said that both of the kids werent at their dads.
What would you say or do?