MIL is insisting that if she gets a narrow booster cushion, she can fit all 3 children in the back of her car - dts (8m) and dd (3).
DD is just the right weight to go on a booster cushion, but imo she is just too small. We've told her we've not comfortable with that, and at the moment she's in a high-backed booster which imo gives her more support and protection. MIL is still insisting that it would be okay "for short journeys", even though she knows full well through experience accidents can happen on short journeys. She had such an accident on a short journey that has resulted in her having to give up work.
I am aware that relations between me and MIL can be strained so I may not be being entirely objective about this, so who do you think is being unreasonable?
Go on, be honest, I can take it .... I think