My mom and dad took my kids somewhere last Saturday. My daughter held my mom's hand and son was holding my dad's. Well my son wanted my mom and ran from my dad and grabbed her hand. He ran in the parking lot where cars could have been coming. Luckily there weren't any. My mom "got onto him" but did not tell me about all this until that night. My son was already in trouble for something else so I did not talk to him about it until Monday. I just talked to him about it but I have not punished. He made excuses about it "no cars were coming." I know he remembers running. Should I punish at this point and if so how?