Billy wasn't a stranger, but they hadn't spoken to him often, either. How would you describe him?\nOptions:\n- family\n- known person\n- friend\n- relative\n- crowd
Let's think step by step.
known person
Billy wasn't a stranger, but a known person.

Billy can be described as a known person for them but they hadn't spoken to him often, either.

.

So, the final answer is known person