This show is the perfect case of bad parenting in both the Hoodas and Siddiquis case. I feel all 4 have suffered/are suffering in some way or the other due to bad parenting.
Harsh left the kids for another woman. After he returned, Anjana's main focus was on Harsh rather than her kids. Arjun has always been the neglected one because he never craved for attention like his elder bro and never complained about anything. He always suffers silently but I am sure one day, he will lose his patience and vent out his anger on all 3. The reason Harsh and Anjana are more biased towards Adi is because he not just expresses his anger and disappointment unlike Arjun, he also gets more drawn towards outsiders like Pooja, Sakshi and now Zoya. Anjana has lost Adi to Pooja and Sakshi. She doesn't want to lose him to Zoya. Right now, Anjana has no idea about ArNoor affair. I am sure she will start behaving the same with Arjun too after knowing about his affair.
The Siddiques are also no less. For the world, they seem to be a perfect loving and caring family but within their home, there's a man who literally controls everyone's lives, who feels he is right and doesn't care for others opinions and beliefs. Roshna is suffering silently under him but I am sure like Arjun, she too will lose patience one day when she will realize Waseem has crossed all sorts of limits in forcing Zoya to marry Arshad. One good thing about the Siddique daughters is they don't silently suffer like their mother. Their father's control over their lives has turned then into rebels.