I'm not sure about this…

My boyfriends is still in high school, he's a senior, but he's not 18 yet. What bothers me is that one of his science teachers asked her class if they could babysit her kids. Like I don't know exactly what was said but that she's looking for a babysitter or sitters I should say. This doesn't sit well with me. Like I feel like this is super inappropriate for a teacher to ask his or her students if they could babysit her kids. I don't know how all the specifics work but I really feel like a teacher shouldn't ask her students to babysit their kids. What also bothers me is that my boyfriend volunteered to watch one and another student is watching her other child. Why would she need more than one babysitter if she has two kids and one is manageable and the other is a baby. My main question is, is this at all okay for her to do or is it just personal opinion?