YSK: If you are a parent in a joint custody agreement, don't trash the other parent or other side of the family while your child is with you, even if you think they can't hear you.
from /r/YouShouldKnow
YSK：如果你是共同監護協議中的父母，當你的孩子和你在一起時，不要對另一位父母或家庭的另一方進行抨擊，即使你認爲他們聽不到你的話。