Do most people know NOT to ask questions regarding a tragedy?

that happened years ago within your family????...because i still have people that come up to me in the store and ask stuff...that is none of their business to know...I am forever saying.."I've had to let go".."That was a painful time"...geez, "I do not remember"....do you think most people would get that??? (also what do you think they are trying to do?) In other words why would someone be sooo insensitive to ASK ABOUT personal stuff?...What to say the next time???