Male Mourning Dove sitting in empty nest?

I just had 2 mourning doves lay a clutch (I think it's called) and the babies are about 19 days old now and have left the nest. The parents still hang around (I know it's to keep an eye on the babies). But the father dove keeps sitting where their old nest used to be. I know it's the father because he has a marking on his body. Is there a reason for this? Do you think he is trying to convince the mother dove to lay her next eggs there again? I hope so!!! :) Any ideas what is going on? Thanks for all input.