Kareem Abdul-Jabbar's son is now being sued after he was accused of stabbing his neighbor in June ... with the alleged victim claiming he suffered a skull fracture and brain bleed in the attack.
We broke the story ... back on June 9, cops in San Clemente, Calif. arrested 28-year-old Adam Abdul-Jabbar after they say he attacked his neighbor during an argument.
The neighbor -- ID'ed as 60-year-old Raymond Winsor -- claims in the new lawsuit, obtained by TMZ Sports, the whole incident went down after he urged Abdul-Jabbar to help his elderly grandmother with chores.