Joey watches his older brother twirl his spaghetti around his fork using a spoon. Joey then attempts to twirl his spaghetti in the same way. Joey's older brother is serving as a for Joey.

Model

Explanation:

Joey's older brother is serving as a  Model for Joey. As Model is person who acts, behavior are copied by other person , especially younger people. In simple when someone admires the style, behavior of other person and try to imitate  than person whose style is copied is Model.

answer; u.s senate;