Ann ) wrote:

I was thinking it might be helpful to say, "Please wait one minute; Mommy
and Daddy are talking, and then it's your turn," and then wrap things up
quickly and give him his say.

It also might help to teach him a specific signal, such as a touch on the
wrist, to indicate that he wants to talk to you. Give him a good thing to do,
rather than another entry in the list of bad-things-not-to-do.

--Helen