Alice is the sister of Bob, and they have a brother named Charles. Bob has a daughter named Donna with his wife Emily. Charles is married to Fiona, and they have a son named George. How is Emily related to Fiona, and what is George's relationship to Donna?

Respond very briefly.
Emily, being Bob's wife, is Fiona's sister-in-law because Fiona is married to Charles, who is Bob's brother. In terms of family relations, sister-in-law is the term used to describe the wife of one's sibling or the sister of one's spouse. Therefore, Emily is Fiona's sister-in-law through her marriage to Bob, who is Charles's brother.
George is the son of Charles and Fiona. Since Charles is Bob's brother, and Bob is Donna's father, George and Donna are cousins. Cousins are the children of siblings, so George and Donna share grandparents and are one generation removed from the brotherly relationship of their fathers, Charles and Bob.