I actually don’t know the age of bani Mouza/bani aisha's grandchildren. So, cannot assume candidates for them.
I am adding MBZ's grandkids age:
Mariam :Tahnoun-2011, Zayed-2014
Fatima: Mohamed- 2012, Saif-2014, Zayed- 2018
Dhiyab: Fatima-2014, Salama-2016, Zayed-2019
Shamsa's youngest daughter, Fatima is also from 2011. So, Tahnoun has two great option, Shamma and Fatima. Marrying Shamsa's daughter will be more beneficial than marrying Saif's daughter.
Did you meant Fatima bint Mansour? Or really Latifa?