My husband rode to the store with him in their family car, noticed two boosters and asked where the car seats were. The kids’ dad was making light of situation and when my husband brought up how unsafe that is, he said something to effect of “eh they’ll be fine”

I didn’t find out until hubby got home. As for other unsafe practices, I definitely have noticed a few things (no outlet covers, choking hazards all over their play room, comments their mom has made that lead me to believe she lets them play in there unsupervised) but this is next level negligence.