My wife and I still remember so well the day our last kid left home. We were sitting at the dinner table, just the two of us. I looked at her and said:
"well, I guess it's just you and me now, they're gone."
It was such a strange feeling, always having one or more of our kids here with us for over 20 years and suddenly they're gone. One of our sons came back a couple of times, but only for a few months before he moved on.
Now our daughter has moved to town, bringing her husband and our first and only grandchild. Occasionally they join us and it's that same old feeling again. Kind of nice.