Paati Mangayam

When I went home last evening, Ashwin was in the toilet. I asked him who took him to the toilet and he replied "Paati Mangayam" What?!?!

What is Appa's name?
Agu

What is Amma's name?
Anu

What is Thatha's name?
Agopayan

What is Paati's name?
Mangayam

What's your name?
Athin

What is aunty's name?
Chatha

What is Appa's name?
Growing tired of this game... Aana!