As the title suggests, my DH will consistently talk over me when I'm dealing with the children for Slamming doors due to anger. During these times I try to have a discussion with the children about taking timeout. What was/was not appropriate etc. Explain you have a few minutes to think about it and then talk and hug after the fact.
I'll be down at my DD's height level for example talking about why a timeout is required and my DH will tell me how to talk to her whilst I'm delivering this.
I will say "I'm trying to talk to her and your talking over us, Please let me finish".
I'm so sad, this happens not just with children related parenting. It's been happening for years and i just finally can't hold it in anymore. Thanks for listening. D