Portwood Williams Sr. died Aug. 10. He was 98.
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."
Notable deaths of 2014 [PHOTOS]
Alyssa Milano departs ABC's 'Mistresses'