Lakshmi, her brother, her daughter and her son are badminton players. A game of doubles is about to begin:
Who is the best player?
Lakshmi's brother and her daughter are in opposite teams and directly across the net.
Lakshmi's son and worst player's sibling are in opposite teams. Since, they are diagonally across, either Lakshmi's brother or her daughter is worst player's sibling. So, worst player can be either Lakshmi or her son. But, son is diagonally across the worst player's sibling. Thus, Lakshmi is the worst player.
This means that Lakshmi's son and daughter are on the same side. Lakshmi and her brother are on the same side. As the best and the worst player are on the same side, her brother is the best player.
The correct option is A.