story of Jamai Raja is the story of Siddharth, who despite being a jet-setting hotelier with a growing empire to tend to, takes it upon himself to repair the estranged relationship between his wife Roshni and mother-in law Durga Devi Patel (DD). While DD has seen the trials and tribulations of poverty and struggled her way up to riches, she has hardened over the years and developed a somewhat condescending view of the middle class. She has no tolerance for laziness and mediocrity. An enterprising jewellery magnate, she is constantly on the move, has a razor sharp mind and a tongue to match. Daughter Roshni, on the other hand, has a rebellious streak. With an independent mind of her own, she isn’t about to treat DD’s ideologies as the Gospel truth. Born in the lap of luxury, she hasn’t let her riches spoil her. She feels strongly for the underprivileged and actively works for their welfare through an NGO she runs. How Siddharth succeeds in his endeavor of bringing them closer emotionally, is what is shown in the show. At then end of the season, it is shown Yash tortures Durga and Roshni and at that spot DD dies.
Roshni and Siddharth have been separated after the death of DD as Roshni thinks she died because of him. She is going to marry Neil which breaks Siddharth’s heart. On the other hand Neil’s family members does not like Roshni and try to break her and Neil’s relationship. Neil comes to know about Sid and Roshni’s past relationship. Payal and Ria come in between and finally Ria gets married to Neil. Roshni gave birth to a baby boy called Karan but in a car accident Roshni and Sid dies. Tai vow to look after Karan (Satya) from now on.
21 years later, things have changed after the death of Roshni and Sid. Karanvir is Siddharth and Roshni’s son who has grown up. Neil and Ria are dead to. Their child is Mahi who is taken care of by Payal(Ria’s sister). It is about Mahi and Karan about their love story.