If someone is assaulting my family member and I step in and beat them up,

[Protagonist.]

would I get sent to jail/prison? Okay, lets say some low life comes in and hits my mom for the heck of it, like lets say he wants to test his fighting skills so he hits my mom. I see this and I punch the guy as hard as I can on the chest and then I do a neck chop, he drops and when he is on the ground I keep stomping on him and keep punching him.

Would I get sent to jail?
what can I do if that situation occurs then?