abigail’s family can be an advocate by first learning about her symptoms and educate themselves on what she may be struggling with. according to the description, it sounds like her grandmother may be struggling from some form of dementia. they can also attend her appointments with her and speak up when she can’t.
Gabriel would then need to ask to see their ID's. If he suspects they are using false ID's then he would need to confiscate them and call the police. If the two minors have no ID then he needs to have them escorted off the property or tell them to leave.
You have to make sure all of the utensils you use to cook are clean and not full of bacteria. It is also preferable that you wash your hands before you begin cooking that way you do not pass any germs through the food.
It is essential everything is cleaned, cooked and inspected.