WireImage Meet the newest Kardashian family member. Late Monday night, Blac Chyna shared an Ultrasound photo with fans via her Instagram account. This will be the second child for Blac, who shares custody of her 3-year-old son, King Cairo Stevenson , with her ex-fiancé, Tyga , 26. Meanwhile, this will be the first child for Rob Kardashian , 29, who proposed to the Lashed salon owner in April after three months of dating. "For a long time I felt like King was going to be an only child.