J.A.
Hi C., I suggest a good bedtime routine. It would even help to make it with the boys and write it down so you can all use it as a guideline. Your routine needs to include get a drink and go potty along with whatever else you choose. After you establish a routine, make a new rule to go along with it... bedtime is bedtime... and stick to it. If everyone gets a drink and potties before bed there is NO need to get up and go again, not in anybody.
If playing and goofing off is still a battle you could have one of them go to sleep in your bed every night with him knowing that you will move him to his bed when you're ready to go to sleep.
I hope this helps, I think the main thing is to be firm. Stick to the rule, bedtime is bedtime!