It was the rule at home when I was young that nobody left the table until everyone had finished eating. When we've had GC to stay in the past we've always sat and waited for them. They are both very slow and very small eaters. I find it most frustrating when I serve them something that they loved the previous time only to be told "I don't like X Y Z" I just roll my eyes at H and ignore them and by magic the food disappears
I never try to hurry them to the point of tears. Though may say "eat up, there is X for afters"
storyette 
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