Father mc naked - Dear McKoy: My father

The reason Misaki started beating Ritsuka was because, at age 10, Ritsuka's personality changed completely, causing Misaki to claim that he wasn't her son.

He also meddles with Arisu's life, such as moving the teacher to another school in order to stop Arisu's new hobby even though said teacher influenced him to become an aspiring guitarist.

After she discovers Ranma's a and determines that his actions are still manly enough for the contract, she deems the curse isn't a failure in and of itself, but she is still perfectly willing to carry out the Seppeku ritual if she feels that his conduct isn't satisfactory.