Brody & Brandon Jenner
Before Yolanda, Foster was married to Linda Thompson, a.k.a. the ex-wife of Caitlyn Jenner and mother of their sons, Brody and Brandon. Their father wed Kris (you know the rest), and Brody and Brandon primarily grew up with their stepdad.
Their father-sons relationship led to a short-lived, pre-Hills reality show on FOX called The Princes of Malibu, the plot of which centered on the fact that Foster had given his spoiled stepsons six months to find jobs and get their shit together. The series only lasted six episodes (and also starred their friend Spencer Pratt), but here's the kicker: it inspired Kris Jenner to pitch a reality show about her own family. Foster's vague connection to the Kardashians, solidified.
Side note: doesn't this kind of mean that Gigi, Bella, Kendall, and Kylie all share a pair of siblings?
God, L.A. is incestuous.
[Photo via @brandonjenner]