Why are house lights parallel?

in parallel series if one of the light stops working also the remaining lights can work

Lamps will only operate at their power when they are subjected to their rated voltage. The only way of subjecting all your lamps to the same (rated) voltage, is to connect them in parallel (because the same voltage appears across each branch of a parallel circuit).

The fact that the other lamps will continue to work if one lamp fails is a bonus!