Will you treat other kids like your own kids?

Just imagine if your relative/somebody else leave their kids in your home(for some acceptable reason). these kids suddenly break your furniture(in purpose),fight with your kids,yelling out loud,etc. What you usually do with these kids?. Will you treat them just like what you do to your own kids?,or will you let them go since they’re not your child and it’s inappropriate to punish other people’s kids?. I know you’re going to tell their parent after that,but I want to know how you’re going to stop their behavior at that time and execute those other people’s kids?. Will you judge them from age,gender,background,relation(nephew,niece,stranger’s child,etc),or else before you treat them?. (Please be honest).