I see only one fault of Armaan that is he would not accepted Wallia's proposal to stay at their house after loosing his own house and GM. He would have taken rented house and that much he could afford. But I understand Armaan might have taken that step as Jassi was pregy and she should be in safe custody. But he could have kept Amrit alongwith Jassi & him it that rented house.
Billu might not be having any bad intention but still staying in sasural for a damad is not looked by open eye in our society. It's the reason why Billu dared to blame Armaan for Jass's miscarriage whereas Armaan has no fault at all its a fault of Billu's own daughter. It may be out his fatherly emotion he said that when Armaan was angry with Jassi.
I have not seen the episode so I should refrain myself to remark but could not as I like billu's character so much. Billu was always nice character to watch thro the entire JJKN show. See when jass's family came back we got back our old interest to see JJKN hai na.