DEAR ABBY: I have a close relationship with my grandchildren and their parents. My 12-year-old grandson eats nothing except fast food and refuses everything else. His parents allow it and even have food delivered for him. His 8-year-old sister watches closely and is starting to head in the same direction. What they do at home is one thing, but it’s a problem for me when they visit, especially for three or four days. Help!

— FRUSTRATED COOK

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