Question 1
Is Karan the brother of Lucas?
(1) Karan is male and child of Sachin.
(2) Lucas is child of Sachin.
Statement 1 tells us Karan is male and child of Sachin. Statement 2 tells us Lucas is child of Sachin. Together they confirm Karan and Lucas share parent Sachin and Karan is male, so Karan is the brother of Lucas.