Travis Barker is your brother-in-law because he is married to your sister Kourtney Kardashian and they have a son together Rocky Thirteen Barker with Kourtney and have kids with his ex-wife Shanna Moakler and they names are Landon Barker and Alabama Barker and he have a step-daughter Atiana Moakler and your mother Kris Jenner is his mother-in-law and his sisters-in-laws you and Kim Kardashian and Khloé Kardashian and Kendall Jenner and Kylie Jenner and his only brother-in-law is Rob Kardashian