The library where I am director was contacted by one of these caretakers from the Netherlands. He was hoping to connect with the surviving family members of "his" soldier. All he knew was the man's name and home town, so he tried our library at a starting point. There was a man on city council who did volunteer work at the library and who had the same last name as the soldier, so we asked if he knew the deceased. It turned out tthat he soldier was our volunteer's own brother! He had no idea people had been tending the grave all these years. The two have been corresponding ever since.