How can we gently comfort a grieving 92-year-old customer?

We always have a regular customer at our workplace; a very kind old 92 year-old man. He's grieving because his 2nd child and only daugher among many brothers from his 1st and 2nd marriage passed away.

He had all sons and only 1 daugher. She passed away at age 70 from cancer. I know there is nothing that will make him feel better but any way to confort him?

Updates
2 d
It was sad seeing an old man cry so much.
How can we gently comfort a grieving 92-year-old customer?
Post Opinion