Actually, the sailor wants nothing to do with the boy, who we eventually find out is an orphan who ran away from the orphanage, trying to find a new Mom and Dad.
When a Black Panther's whole family is wiped out by a ruthless band of assassins, he's determined to avenge their murder. The gang think he's weak but they didn't reckon with him employing the aid of a martial arts genius.
A old beggar from the woods secretly teaches Chien Fu kung fu as he can't afford regular classes and his "dad" doesn't want him fighting.