I agree with offering to loan a car seat if you have one available....other than that? I would mind my own business. You can't blame yourself if something happens to the child when they are not in your care. It's up to the Mom to keep the child safe once the exchange of care takes place. You putting the child in a car with no seat is your problem, the parent choosing to do so is their responsibility. Lending a care seat is a great idea...I also have extras in the garage to lend. You have to think back to the days when car seats weren't even required. When I was little we got into a really bad car accident and the only one who was hurt in any way was my baby sis, she was in a car seat and bruised very deeply by the restraint. now am I saying car seats are worse than none at all? no way! they are required by law for reason but not the end of the world if not used. IMO...I try to draw the line when the shift in authority happens. Its the Mom's choice to put her child in possible danger with no care seat. Now if there was any form of abuse I would step in.