What would you do if your significant other put their hands on your sibling?

Anonymous
In the case of a altercation between your sibling and your partner who's side would you pick? Say your significant other put their hands on your sibling. May this be your girlfriend put their hands on your younger sister or your boyfriend puts his hands on your younger brother. For example I think my boyfriends sister is out of line, because she allowed her boyfriend to get away with putting his hands on her younger brother. My boyfriend is 21 and his sister is 24, but her partner is 26. She allowed her 26 year old partner to get away with trying to fight her 21 year old brother. Her partner was being inappropriate while she wasn't present and making advances towards me, my boyfriend called him out on it in which his sisters partner proceeded to swing on him. Her partner punched her younger brother and then proceeded to cause damage on her young brothers vehicle ie. swiped the side mirror off the vehicle and cracked his windshield purposely. She did nothing when her brother told her what her boyfriend had done and she went along with marrying her boyfriend anyway.
What would you do if your significant other put their hands on your sibling?
10 Opinion