There's really no place for Daddy coaches beyond middle school, it doesn't matter if it's club or school. Even the ones that don't favor their kid should have enough common sense to know that it doesn't look good.
It depends, because every situation is different. Dad coaches can favor their kids, absolutely. But they are also more invested in the team than some coach that is happy with just fulfilling the minimum. And coaches who are dedicated are hard to find.
