I went for an interview today with the agreement that MIL was to pick the kids up from school (4&6yrs) which was nice of her to do. I don't have her number so I texted the other half that I was finished and that could he txt his mum to ask if she's home so I can pick the kids up. He replied saying she will drop them off. Great! Appreciate it. Only until she arrives I say thanks for picking and dropping them off ect..... I asked her if she wanted me to take the car seats out of her car (they're our car seats) she replied "oh no they didn't have car seats today, he (OH) forgot to drop them off before work. Turns out she asked him in the morning about the car seats and he just told her to put the seat belt on. Not one of them bother to mention it to me. The fact she didn't go drive to his work to collect car seats is beyond me. All this has caused upset and both of them can't understand why I'm making a big deal? They allowed risk of danger to our children and he thought it was okay and to of not told me? What would you do in the situation?