I not take children of people we have personal relationship with. It harder to enforce own policies with friend and neighbor because we not wanting bad feeling to cross from professional relationship to personal life.

Some friend forget it business and sometime think 10 min late not big deal because we friend. Some neighbor think paying in evening instead morning not big deal because we not able to deposit fees until finish work.

See many provider who lived regret this situation. When they speak up, parent can feel that they not being good friend and if it go wrong, make for tricky situation if seeing neighbor daily or have friend in same circle.

If you have do it, I would sit down before and be very clear that this business arrangement and during business hours, friendship not come into it. That value their friendship but not able to bend rules for them during work day and make sure they fully on board and respectful of it. Could be very awkward if this not clear from beginning.