The image below is from murderpedia.org the following makes for grim reading:

We discovered that Jane’s father Joseph, shares DNA with a first cousin of Lise Jane. The shared amount of DNA puts Lise Jane’s cousin in the region of 3rd to 5th cousin to Joseph.
Joseph, Jane, and Ian share DNA with Megan and Cheney Louise’s father to demonstrate how closely we can all be related. The murdered girls father is in the region of 3rd to 5th cousin to Joseph and Jane.
When researching family history and genealogy, be prepared for surprises! You never know what you might discover!