All in the Family ;-)

This sleuth's brother Mycroft is even smarter than his sibling is. But he certainly doesn't have the same ambition or energy! In fact, he rarely leaves his club, the Diogenes. Which of these sleuths is Mycroft's brother?

This sleuth team is perhaps the most famous father-and-son detective duo. Which of these sleuth teams keeps it in the family?

In 'Clouds of Witness,' Dorothy Sayers' sleuth has to clear his brother Gerald of murder charges. Who has to deal with this family-style murder investigation?

Ystad police detective Kurt Wallander has ongoing issues with his father, which aren't helped by the older man's deteriorating mental health. Who created this more-alike-than-than-they-know father-son pair?

One of Kerry Greenwood's sleuths has very unconventional 'back-to-nature' parents who use an earth closet and wouldn't dream of eating meat. Which sleuth's parents go by the names 'Starshine' and 'Sunlight?'

Arnaldur Indriðason's Inspector Erlendur is troubled throughout the series by the disappearance of a family member. Which family member's loss has affected him so deeply?

In one story arc of this series, Chief Inspector Armand Gamache of the Sûreté du Québec ends up keeping police detection in the family. Who is Gamache's creator?

Domingo Villar's Vigo-based police sleuth Leo Caldas sometimes visits his father at the family vineyard, just to take a break from the stress of his job. Oddly enough, though, it was his mother who brought winemaking into the family. In which country is Caldas based?

University of North Norfolk archaeologist Ruth Galloway has more than her share of pressure from her straitlaced, conventional, religious parents. Who is Galloway's creator?

Teresa Solana's Barcelona PI pair Eduard Martínez and Borja Masdéu are related, although a lot of people don't know that. What is their relationship?