This was always one of those issues that I struggled with as a parent. My kids like to sometimes get up and read as well.
In the end, I decided that the battle wasn’t worth fighting. There were far more pressing issues that I want to impress upon them… such as table manners when actually sitting at the table.
In the end, I think the ability to sit through a meal to the end will come on it’s own with additional maturity. Table manners, OTOH, will not.
The Wolf