Jeff's mother, Jacklyn Bezos, welcomed him in 1964, while she was married to her first husband, Ted Jorgensen. They split when Jeff was 17 months old, and Jacklyn eventually met Mike Bezos when he was attending the University of New Mexico. The pair wed in 1968 and later welcomed Jeff’s two younger siblings Christina and Mark. Christina was in 1969 and Mark followed in 1970. According to a 1997 Amazon SEC filing reported by Bloomberg, Christina and Mark were two of his family members who decided to invest. The year prior, they each bought 30,000 Amazon shares for $10,000. inancial experts believe that if Christina and Mark did not sell any of those shares, they could each be worth $640 million as of 2018.