I borrowed boosters from my carpool partner today (the only two she has) and they're both expired. One expired 2 years ago and the other looked really old, but I didn't check for a sticker. These are the boosters dd sits in when she rides in my carpool partner's car twice a week.
So, what would you do in my situation? Buy a new backless booster and give it to her for dd to use when she's in her car? I don't mind the expense of doing that, I just don't want to offend her. How would you explain why you're giving her the booster tactfully? She's very smart and a friend of mine, but doesn't take car seat expiration dates seriously.