Can I baby be left at a fast food restaurant with a 14 year old while the 18 year old mother gets her nails done?

I would love everyone's opinion on something that just happened earlier today.

This has to do with a mother that's 18 years old, her daughter that's a year old,her brother that is 14 years old and the father of the 14 and 18 year old.

The 18 year old daughter asked her father if her little brother could go with her for 30 minutes today. The father said it was fine and the 18 year old picked him up and they left.

A few hours later the father gets a text message from someone telling him that his 14 year old son and his grandbaby were dropped off at a fast food restaurant. For the story lets use McDonald's. At This McDonald's the 18 year old sister's other sister and other brother are working in the back.

The father after numerous attempts to get answers to his text, gets in his car and goes to pick up his son and granddaughter.

The debate here is that the 18 year old daughter is telling her dad there is nothing wrong with leaving her baby and 14 year old brother there. Telling him he's being dramatic.

I'd love to get opinions and if you have more questions please me know.

I know my opinion but we are wondering what others think.

Thank you