There are 4 houses that stand in a row. One family lives in each house.
The O’Connells live next door to the Taos, but they don’t live next door to the Sosas.
The Prasads don’t live next door to the Sosas.
Who lives next door to the Prasads?
Try writing down the names of all 4 families and draw in the connections you know.
If there are 4 houses in a row, 2 families will be at the ends and have 1 neighbour each, and 2 families will have 2 neighbours.
Although the question asks us about the Prasads, the best place to start is looking at the Sosas.
The Sosas aren’t neighbours with the O’Connells, or the Prasads, so they have to be neighbours with the Taos. They must live at one end of the row.
The Taos are next in the row. Next to them live the O’Connells, in the third house. Finally, the Prasads live in the other end house.
So the Prasads live next to the O’Connells!