Question 1
Karan and Aarav are brothers. Mary is the child of Karan. Mason is the child of Mary. Elijah is the child of Aarav. How is Mason related to Elijah?
Mason is a grandchild of Karan, and Elijah is a child of Aarav (brother of Karan). Since Mason is one generation further than Elijah from their common ancestors, they are first cousins once removed.