he can read beyond her words...he has always done that..ans now it's not everything about dev..his family influences are also there..he has noticed that she is giving in this way too much almost forgetting her own identity..and of you see from father POV.why he will even like it when he has nothing seen from Dev or his family side doing anything like this...h supports her in her decision but he will not let her consume by her decision..
When sonakshi cleared it out to him that dev hasnt asked her to do so ..he didnt understand that as well..and he knows her daughter well..she wont agree to anything blindly !!