My youngest is 6yrs and about 125cm tall. It is a legal requirement (UK) for her to (at the very least) use a booster seat while in a car.
My kids are just back from their dads, and they have told me that my youngest has been driven in my exh's gf's car (in the front seat!!) and exh's gf's sisters car more than once and has not been on a booster seat. Apparently gf said it wasn't a legal requirement and was ok as it wasn't far anyway (one journey was at least 30miles!).
I am fuming!! AIBU to be so upset about this? Also, assuming I'm not over-reacting what would you do about this? I have had to speak to my exH before about our DD not being in a car seat when in his care. We do not have an amicable relationship and parallel parent with me being the resident parent (about 70% with me).