DC are 5 (nearly 6) and (just) 3. They both never shut up talk a lot.
When they are with me they both want to talk to me but don't seem to have any awareness of the other.
I think dc1 is old enough to know it's rude to interrupt or talk over someone and to be fair when reminded she will wait while younger dc talks.
I do ask them to take turns and constantly remind them that the other is talking but it is hard work and doesn't make for relaxed conversation!
And to think I was looking forward to dc1 to have someone else to talk to besides me!