To refuse to do this?

[CartoonFig]

One evening a week until around 6:30 I watch my husband's kids along with ours whilst he finishes at work (he has to stay later this day).

One of them wants to do a hobby on this evening and I've been asked if I'll take them so they can do it. It's about 15 mins away and I'd have to stay. I've said no. I have his other kid too and our young child who'd have to be dragged along.

AIBU to say that I'm not taking them so H or their mum even will need to sort something between them if they want to go?

It's not about whose children they are, it's 100% about the timings and inconvenience to the other children in the household.

We would never have been able to routinely take my 2yo SD out in the car at that time of day, she would 10000000% have fallen asleep and it would have made the rest of the evening, night and the following day a nightmare. It just couldn't have worked.

Sorry, I hadn't seen the OP's older/other posts about her husband treating her like a babysitter to be taken for granted. That's very sad and unfortunate, and seems an issue that's taking a toll on family life. I wonder if it might help to try to face this underlying problem head on, whether through a series of planned conversations, a couples counselling setting, or some other strategy?

It's unfair of the husband to treat the OP like a glorified babysitter, but it is also unfair for the 9-year-old to be the one to suffer. It may only be a hobby club now, but what about the next conflict, or the one after that? If forcing the OP into a disrespected babysitting role causes resentment, at some point the child will pick on this resentment as well and may internalise it. I'm not sure what the solution is, but it seems like the underlying problem is a more pressing matter than the hobby club itself.

@vampirewellness

So DH expects you to sit in the car for an hour with a toddler and another child at dinner time?

Would he do this if he was available?

Ask him this OP. I think we all know the answer to this one but still.

What happens when your child is I'll. You wont be able to take them then

Of course DH wouldn't go with all 3 kids over dinner and sit there for an hour.

But women should do so.