I can see that being true. the ending credits the penny rolls over the map that Iris made of all the families being killed. As it's rolling it shows clips of some of the deaths in the headlines. I wonder if any of them is a reference to any deaths in the previous movies
Actually thinking more about it, I dont think that's true. I think the skyline is it's own thing. I dont think any of the people in the first movie were related to anyone in the skyline.
Sidenote: I thought in one of the movies you can make death "skip" over you if you survived it's initial try? Maybe im misremembering, it's been years since I've watched the first couple ones.