@MrsRLH75
You are not unreasonable at all. I never understand why some people mock people who get upset if someone they have never met dies. It's even understandable to get upset over a celebrity's death IMO. Sometimes they feel part of our lives.
And yeah, it is very understandable to be upset at the death of a mother and her 3 children. It's upsetting, even if you didn't know them. I heard about this too today. Awful! 
I knew a woman (vaguely,) some ten years ago, who was a mother of 2 children. I met her a few times in passing, and spoke to her maybe half a dozen times. She was murdered by her boyfriend, in front of the 2 children, after she tried to end their relationship.
I was so upset, that couldn't sleep for a week for thinking about it. And even now, after all these years, I still think about her, when I drive past where she used to live - 5-6 miles from me.
I also felt upset at the death of a man who died saving his children from drowning (in Barmouth during this summer.) Seems like such a tragic, senseless loss. He was only about 30. (The kids did survive by the way.)