How about I scold my SIL's children for obnoxiously running in circles at a wake?
Were they being disruptive?
They're being very bad at this wake and it should be a somber time.
Children can be a handful sometimes. Did you talk to your SIL about their behavior first? She should be the one who should correct the kids.
I don't give a damn about her kids.
I see that the kids are upsetting you, but scolding them might not be the best option. Try talking to them or better yet, consult your SIL since the kids are her responsibility.