Dev is so wrong to invite Sonakshi into the family picture. The family is just knowing about their relationship, so they not understand his personal emotional attachment to Sonakshi.
When he couldn't even tell them about the relationship, why is he forcing her on them now. At let them start their own connection with her as a sister in law...before going forward.
Dev seems to deaf and blind to the awkwardness going on around him. He didn't notice that his mom only wanted to go out with him?...come on! just look at her face.
Sona notices everything she seems to know his family better than him.
But this is reality. Even my husband doesn't understand why I try to give him and his family some space...I hate the awkward look, but all men are so blind to it.