Haye re nandkisore!

During the party Buaji tells Mami "ab hello hi bye bye chodiye nandkisore ka naam lijiye" or something to that effect!

I let it go as a random one liner which showed the contrast between the two ladies only to be bombarded by the news that that's the name of ASRs cousin! Fits in perfectly in hindsight!!

My only question is is he Mami jis son? coz ASR is not shown to have family except the people living in RM...And if he is why didn't mami show any reaction at bua jis dialogue!