if you are correcting them yes, but not in the way of grounding or punishments

Discipline means a lot as children are really trying to learn correct behaviours. I think it could also mean teaching children not to do to others what they would not like done to them. This may mean a firm time out and some calm conversation, with another time out to reassess their responses and changed behaviours. However, "Discipline" can become subjective and limited to the strengths or weaknesses of both the child to be receptive to guidance and the caregiver/parent's patience. Also, in public spaces it can be tempting but do be careful if you're not being offended or attacked by the child/children- I usually stand back and see what their adult caregiver does or report it directly and quickly to them. Our world is no longer about "a village raising a child" to be the best citizen. Good luck!

DISAGREE,JUST HAVE A CHILD DO A TIME OUT AND LET THE PARENT KNOW AND HOPEFULLY THE CHILD WILL LEARN A THING OR TWO ON BEHAVIOR..

Always ask ahead of time what kind of discipline they would like you to use if their child misbehaves. If you aren't sure, I would put in time-out & make them apologize. But NEVER discipline a child whose parent is close by - I once had a "friend" at church spank my child for misbehaving when I was right in the other room & should have been called to deal with the problem as I saw fit.

See something say something, or report photos say a thousand words.

yes

Maybe check with the parent(s) first before watching other people’s children and letting the parents know what you will not put up with from their children ( for example destroying property in the home, hitting others and bad language). Children are teachable.

Yes. You are in charge of them and misbehaviour cannot be ignored. They may be testing you also. Of course, smacking them is not on. Tell the parents and make sure they discipline them. If they don't do not look after them again as they are disrespecting you and this the children will pick up on and their behaviour will probably become worse. My house, my rules.

I think it's okay to discipline someone else's child. NOT okay to strike them but you can surely raise your voice a little and tell them to knock it off. Be sure to tell the parent/s when they return exactly what happened and how you handled it. If you're okay with their response to how you handled it, great. If they intend to discipline them further ... take away screen time, etc. ... also great. If they laugh at you and tell you that you overreacted it's just kids being kids, never watch their kid/s again. The kids will know they got away with it and push you further next time. For your sanity just say no.

If the child is under your wing for the time being, don't hesitate.

YES AND KNOW BUT YOU HAVE TO BE VERY CAREFUL IN THIS DAY AND AGE HEADS UP SORRY

Absolutely and yes I have done it in the past.