Is not killing the ants spread throughout the house considered disobedience to parents, and what is the ruling on killing ants in the mentioned cases?

Scholars have differed on the ruling concerning killing ants. Some have forbidden it unless they are harmful, while others have permitted killing small ants (dharr), even if they are not harmful.

However, if the ants are harmful, whether to the body or property, the general consensus among jurists is that it is permissible to kill them. Some have even gone so far as to deem it recommended.

Accordingly, it is permissible to kill ants if they are harmful, such as spoiling food, and obeying one's mother in this regard is obligatory, provided it does not lead to excessive hardship.