Nowhere near as much as they'll miss their father, or as much as she will miss her husband, he doesn't say.
He'd left the wedding ring behind just before he left, placed near the family photographs on the table near the door. To allow her to grieve in private. He knew that a personal handover would be to ask too much of both of them. He'd wanted to try and minimise the suffering, not add to it.
It takes him longer to look up this time. "Thank you for taking care of him. I'm sure he appreciates it."