9 year old in booster seat?

I watch a 9 year old and take her places in my car. I have a spare booster seat from my niece so I got it out for her to use when she’s with me, but i was informed by her guardian that “she’s 9 she doesn’t need a car seat, she rides in the front seat now.” This is poor parenting in my opinion because she is very... show more I watch a 9 year old and take her places in my car. I have a spare booster seat from my niece so I got it out for her to use when she’s with me, but i was informed by her guardian that “she’s 9 she doesn’t need a car seat, she rides in the front seat now.” This is poor parenting in my opinion because she is very small and it goes by weight/height, not age. I can’t force her guardian to make her ride in a car seat but surely I am being sensible by making her when she is with me correct?
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