Kanye West attended his grandfather's weekend funeral in Oklahoma with his girlfriend Kim Kardashian and their 2-month-old daughter North, People.com said.
His funeral was held Saturday.
"That's why they weren't at Kylie's birthday," a source told People.com about why the couple missed the Sweet 16 party for Kardashian's half-sister, Kylie Jenner.
"They brought North, too. Her first trip."