Sahir adopted by the owner of Saiyara & NH.
Zeenat and Shiraz = bro & sis
Alvira marries Zeenat & Shiraz's father who was a widower.
At the moment Alvira is too confusing because of how she has been shown earlier. She has not shown much affectionate for Sahir, Shiraz and Zeenat but have been shown to be fair and respecting them.
Heres my thoughts:
I feel that , Shiraz and Zeenat may be siblings of Mr Choudhary, who owed the company and NH.
Sahir was adopted, later became a good designer for Saiyara.
Alvira married Mr Choudhary, so becomes step mom to Zeenat and Shiraz, then has Zaki.
After Mr Choudhary's death, she run the company but was not very successful, they all have shares in the company and house.
Alvira, seeing Sahir being a good designer got him involved in the company, then convinced Sahir & Zeenat to get married ensuring the business and house remains together so nobody takes their share and break the business and house up.
Zeenat being spoilt needs new toys to be entertained and be happy, just like Zaki, Shiraz not interested in the business.
Sahir indebted to Mr Choudhary and Alvira for taking care of him, hence has looked after them even after Zeenat being in coma.
Since Zaki has grownup, Alvira wants all this to belong to him. Hence wants him to get the VP in Saiyara so eventually he takes control of everything.
Alvira brought Anam in to help Sahir in making the company 1cr as per the promised made by Sahir to Zeenat.
Basicially Alvira has used everyone to make Saiyara a successful business and wants all this to go to Zaki.
At the time of Zeenat's accident, she may have left Sahir for a rich guy, also while being married to him was always being dissatisfied with her life and wanted more, Sahir has been waiting for her to get better to show her what she rejected and intends to divorce her. Sahir has not moved on because their lives are complicated and needs to be death with carefully so as not to break the company and the house.
Initially, Sahir did not want Arzoo in his life because of all the complication but gave in due to loving her and did not want to loosing Arzoo forever to Zaki.
So Alvira wants everything, Anam wants Saiyara and Zeenat wants Arzoo out of Sahir's life.
Zeenat, Alvira and KA in this together, yet playing their own individual games. Everyone using each other and making Anam and Zaki their pawns as and when to use them to suits themselves.
I hope it is not too long. What do you think?