Asking passengers to switch seats with parents so they can sit with their children is fraught. No one wants to sit next to your child! If they’re a teenager surely they’re fine sitting alone! And please don’t ask me to take a middle seat in standard coach in exchange for my extra legroom aisle seat!
Here’s a twist that I haven’t heard before, though: a father who asked a passenger to switch seats so that a mother, who was caring for two children (a toddler next to her and a lap infant) could sit with her third child also… so that her husband could sit alone in peace.