I sympathize with your situation which is VERY common, especially since he is just reaching that age of atonomy where he realizes he is a person with needs and can demand things from the people he has the most contact with. BUT that is all the more reason to set boundaries and teach him there is a time and a place to get his needs met appropriatly.
So what I would suggest is to first talk to your son and explain to him number one, that you do not interupt when adults are talking and number two that it's important that mommy and daddy talk because you are best friends and to stay best freinds, you need to talk. Then make dinner family time and involve him in your conversation, but make it clear that he has a turn to talk and a turn to listen. Tell him, "why don't you tell daddy what we did today" and encourage him to share and remind him about specific details like "where did you go" "who did you see" "what was dora the explorer about today" and encourage him to share his story. Then when you sense he is done, have your husband tell him that sounds like a great day or somthing encouraging. Then make it very clear, now it's daddy's turn or mommy's turn.
Also, somthing that will help, is give him and your husband time at night that is all theirs so he can look forward to it and it can be a reward since that is what he wants (and it gives you a break). My dad read me a story every night before bed (and now my husband does the same to our daughter). It's their time for about 30 minutes and his focus should be completely on him. This will also help you have a routine bedtime schedule (7:30 or 8:00 is good for a 3 year old).
It may take time, but your relationship and the tools you give to your son will be worth it!



