My Hubby is trying to help out his cousin's wife but little do I know she left with her 2 year old…

My Hubby is trying to help out his cousin's wife but little do I know she left with her 2 year old son whom doesn't have a car seat she forgot it from her Husband's car on the way back to Florida.. Back then I would think its no big deal not having a child yet but after reading about car seat Safety on Mom Life I know it's not right even if they went 20 minutes from the house. I know his cousin's know better she was helping with the car seat/stroller I have here. Hope this never happen ever again.. Don't want them to be I'm trouble then my hubby would say I talk too much.