I feel for you
We are going thru the same thing in our household at the moment
My Zach likes to tell me things
When there is a noise
When there is someone outside
When his brother Mike is on the couch
When he wants to play with his toys
When he wants to go outside
Yada Yada Yada
And all this talking ... adds up
So I am curbing it
We are doing well
But you have to get him to stop barking immediately
however way you can by getting his attention
Yelling
Shaking a can
water pistol
But when you yell it has to be a one or two word order
because if you give him a sentence ... they will think that you are joining in with them in conversation
and that will do the opposite of what you want to do
Then once they stop you must reinforce the order by saying NO Bark
and make sure that they do stop
many times its all fornothing because you get their attention and they start barking again