Actually quite interesting to see the dynamics of LHL's family through this.
Li Hongyi went to the wake together with his father and mother, but all three didn't attend the cremation. (No mention of the second son, Li Haoyi, at all by the media. Perhaps there's a reason he can't attend?)
Li Yipeng went to the wake on his own, and showed up for the cremation. Cremation is usually only attended by close relatives and friends, and he's the only person from LHL's side of the family to attend, so he's probably in LWL's "white list" to attend.
Perhaps can infer from above who's really in LWL's "black list" and barred from attending her cremation?