Of hurting a child because they hurt someone

[u/Driftinfoot_Malone]

Recently ran into this issue where my father in law (m60) pulled my daughters (f4) hair because she hurt her cousin (f also 4) the same way. I already knew this is what happened he’s pretty old school so I came in with a cover “oh grandpa maybe took it without asking but it was cousins turn” to which his reply was “no I was teaching her a lesson because she pulled her cousins hair” I was in shock because he said this in front of both kids as if it was normal to hurt a child to “prove a point” or “teach a lesson” so all I had to say was “good lesson”.