Will the court see this as negligent if I leave my child in a fast food 20 minutes earlier the pick up?

I have a 19 year old and a 14 year old. The 19 year old lives with me and the 14 year old, I have second and fourth weekend visitation. Pick up is after school on Friday. This is done to avoid confrontation with her mother and fiancé who repeatedly cause a scene. The judge ordered this. But drop off the judge ordered to meet at McDonalds. Can I drop off the girls 20 minutes before her mother and fiancé get there so they can eat in McDonald's while I shop at Kmart in the same parking lot until she is picked up to avoid any confrontation? I will be inside the whole time and will not even see her mother or the fiancé. My oldest is 19 and is an adult. This is solely to avoid confrontation and to ease the stress off my 14 year old.