Question:
I saw someone’s child washing a stain off their pants on Shabbos. I did not say anything to them, although am wondering if I have a responsibility to educate them in matters that are forbidden on Shabbos, or is this only upon the father of the child? The child was certainly above the age of Chinuch.
Answer:
According to some Poskim, including Admur, you are not required to inform him or stop him, as this obligation is only on the father, until the age of Bar Mitzvah. Nonetheless, it is proper to tell him anyways.
Sources: See Admur 343:1; Michaber and Rama 343:1; M”B 343:7; Piskeiy Teshuvos 343:2