Mamujaan and Mumani are directly related to Zoya. In the the sense that they're her real Mamu and Mumani. They came together (framed Rashid) killed Zoyas mom- or even better implanted in Rashids mind that he's the culprit but put the blame on Zoyas father (hence he may be in hiding). ALL to get money. How Shireen plays into all this...and why Rashid is so important I'm not too sure...like I mean the deeper reason.
MAYBE, Rashid and Zoyas dad were business partners and Rashid has ownership over the business. But Dilshaad knew their evil ways or thoughts. Hence she was firmly against them...
This all makes sense to some extent...
You guys feel free to tell me how you feel !