Kim Kardashian always keeps her kids as her first priority. In an emotional conversation with mom Kris Jenner in the second episode of season 3 of The Kardashians, released Thursday, the SKIMS co-founder, 42, opens up about how public drama with ex Kanye West affects their four kids — Psalm, 4, Chicago, 5, Saint, 7, and North, 9. “I still …