DS1 is now 7 but these rules have been in place pretty much since he was out of his highchair and sitting up to "big table":
• Sit properly on the chair
• Chew with mouth closed
• Don't gulp drink
• Use fork (and knife) where appropriate, not fingers
• Don't talk with your mouth full
I would have liked to have included:
• Don't leave the table when others are still eating - but sadly DH fucked that one up because he always leaves the table first, rude, but he's an adult so I can't stop him
• Say thank you for his dinner - he does this sometimes but again, hard to enforce with DH's poor example in front of him. He does do it spontaneously now he's 7 and has been to other people's houses where it is a rule, which is rather nice. :)
• Ask to leave the table - he does this sometimes, but not because I enforced it, more again from following other people's example.
He lays the table when I remember to ask him, and he now always puts his stuff in either the sink or the dishwasher as appropriate. And says thank you for his dinner quite often too.
My parents also had "no elbows on the table" but I haven't bothered with that one. We all eat dinner together at the table every night; lunch used to always be at the table before he went to school, and breakfast is always at the table, but owing to different start times, he's usually breakfasting alone.