Is it a siblings responsibility to watch over younger siblings?

Just saw a Facebook post about how a mom was irritated at her 8 year old son for not being able to focus and having behavioral issues.

“I'm 7 months pregnant and ask him to please watch siblings while I take a short nap so I can keep my eyes open to take care of them. But I wake up and they have got into so much and destroy the house and he is staring at the tv.”

-from the post.

Thoughts! Opinions! I personally wouldn’t make my oldest watch her sisters for me to do anything besides do a quick pick up around the house. I was always forced into watching my younger siblings, I never wanted to and it made me almost grow up disliking my parents, I could have been doing so much as a child, but I was stuck babysitting.