
A child who does not know how to play like his age. That's just too sad. For the mc & us readers, not just as a mother but as a human, it's just plain cruel to see this type of "education", that's why she's doing her best to interfere with these.
We also need to remind ourselves of the mc's knowledge & perspective.
She does not know Ain's real personality here. She still sees him as a child being forced to drinking poisons (like wth) & an innocent one at that, and the duke who is enforcing these actions.
She is also from the modern times. Who in their right mind would see a child being educated to enhance their endurance against poisons & think that it's normal?

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAi need your other eight siblings, if you do have themAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
if you hate this story and want to drop this, then do so. that's YOUR decision.
but PLEASE, don't ruin this for the other readers.
if you have nothing good to say, post it somewhere else or give a prior warning that you're going to say something negative, and the readers can choose themselves whether to read it or not.
No one is forcing you to read this story. You don't have to rant it in the comment section.