beagles are extremely stubborn. on the flip side, they are extremely loyal.
So here's the deal, use simple commands and make sure everybody in the house uses the same commands for the dog. It's taken two years with out beagles, but they finally obey commands about 90% of the time.
sit = sit down.
down = lie down.
off = get off of what ever you are on (sofa/people/chairs/tables/etc)
go to bed = go to your bed and stay there.
come = where ever you are come here (we also have a whistle we use in case they are too far to hear our voice)
no = obvious
shh = be quiet
out = get out of here
We still have trouble with them barking, but they are hunting dogs thats what they do. They still get in to any kind of food they can find including garbage (it's a beagle thing).
With all their bad behaviors, they're still the best dogs to have with kids. I never worry about my kids and the beagles. However I'd never leave my kids anywhere near my sisters 1/2 black lab 1/2 rottie.
Most importantly you need to establish YOU are the boss of the house. Once you do that and you keep that established, they'll follow commands a lot better. Beagles are a lot of work, but they're so dang loving and loyal it's worth the work.