“It's often parents of one child who think it's no big deal for SAHMs with several kids to take on their child for the day”
YES to this!!
It’s inly 8am, but already this morning I’ve woken up to one of the “usual suspect” mums texting me to ask if I could “just hold onto” her DS on the Friday after school finishes.
Firstly, she has had the term dates all year like everyone else so has had ample time to make arrangements for this odd day.
Secondly, she does this every year.
Thirdly, I know full well she’ll be dropping the boy at 7am and my DD will have to be up and entertain him, whereas, otherwise, nobody will be surfacing before 9-10.
Fourthly, this child is a boy and my DD thinks he’s annoying
Finally, this woman is s CF and I could do a thread on her. She will have texted everyone in the class asking for a day here or there. Everyone has caught in to her this year though.
I replied to say I didn’t think I could have him as I have to go to the airport that day to get my elder DC and wouid by want to drag her DS there as well. She replied instantly with, “Not to worry at all, DS loves airports!” 
She has no concept of what it’s what it’s like to have 4 DC. As if I’m able to just be at home all day on an 8 year old agenda, making cakes and doing fun scooter rides in the park or whatever. Er no. I’ve got one teen flying home and two other DC to factor in. So that will be a “no” this year. It will also be a no go the other 4 days she’s tried to “pencil me in”. Get a bloody nanny fgs! The woman is a lawyer.
She’s already asked me to take her DS to the after-school party after they break up at 12 on the previous day. I’ve agreed to this and I will drop him home with several others who also need dropping home, but that’s it.
I’ve also had someone else ask me to have her DD from 12-4 on the same Friday. At least this girl is actually one if DDs friends, but I just don’t want to commit to being stuck in for the afternoon. Again, another only child. I do appreciate it must be difficult, but I’ve just had enough!