Answer:
He may want to form a connection with his ancestor's traditions and culture, and it can help him figure out who he is.
Explanation:
I'll give an example that you can use in his situation. Let's say that Will's ancestors were Jewish. After he learns this, he may want to connect with that religion and form a sort of bond with his far off family. For other people, learning about their familial history can help keep it alive.
Many Native Americans today learn dances their ancestors had created, and learn their crafts and food. This helps keep their culture alive, and can help them pass it onto their children in the future. It also gives them something to be proud of, since their ancestors were very cool.
Hope this helps, good luck xx