Insecurity and a feeling of entitlement of Ladla and Biwi goads them to say and do stuff. Baa Baghwan cannot see beyond the Moh for her Ladla and anything or anyone not towing her and her Ladla is scorn worthy in her view,
It is sad that a man can fool his family easily and live a double life but even one night when a woman is stranded is concluded as a one night stand.
So the context for the showdown is set. The Ladla biwi and BB see no sense Kinjal is away and with none capable of defusing the man bomb will erupt. We will see Leela ki Leela and hopefully anupamas exit from the Pagal Khana.