Yesterday I met __ European playing with the boy . Fill it with proper article.

Hemant said to Naitik, 'that boy playing with the football is the younger of the two brother of the daughter of my Father's wife' how is the boy playing Football related to Hemant?

Deepak said to Nitin, " That boy playing with the football is the younger of the two brothers of the daughter of my father's wife". How is the boy playing football related to Deepak ?