Negative influence on a child's nutrition

Marc,

     I have been bodybuilding for years and currently follow your basic "keto" plan.  My daughter follows my eating habits for the most part.  But when with Aunts/Grandma is being told RIce and Bread are bad for her.  While at the same time being fed things like graham Crackers w/ frosting.  It's a constant argument.  Where and how would you approach this?