On telling descendents of abandoned time capsule homes

Do you guys think its okay to tell family members of the last owners of abandoned homes that their family member left things behind there? if so how do you go about it?

I'm asking because i found out about 6 months ago that one of my partners childhood friends is the grandchild of the man who lived in a location on here. Ive been there many times and seen all the stuff left behind by this man and I'm unsure if it would be overstepping to tell him. The house was abandoned over a decade before he was born, and I dont think he knows anything about it/that it ever belonged to his family. Should I tell him? he lives with his parents just down the road from the house. I just don't want to overstep or upset him or his parents as I don't know the storytelling. All I know is that it was owned by his grandfather and now its owned by the next door neighbours who are family friends of ours (and theirs?)

I hope this makes sense, its just been weighing on me a lot since I found out.