Translation:The entire family died seven years ago.
FWIW, I can think of one scenario, which may or may not work from the Czech perspective. Two people are discussing why a house that looks very nice has not been sold, after more than a year on the market -- A: "I don't get it. I thought about that house myself a couple of months ago. It was too expensive for me, but it looks great, inside and out. Do you know anything about it?" B: "Well... I don't know if this is true, but I heard that a whole family died there about two years ago. Maybe that's scaring people off."