If ‘A’ and ‘B’ are brothers and ‘C’ is the sister of ‘A’, ‘D’ is the sister of ‘E’ while ‘E’ is the daughter of ‘B’. who is the uncle of ‘D’?

Sita, Ramanand and Suresh are the children of Mr. and Mrs. Malhotra, Rani, Raja and Satya are the children of Mr. and Mrs. Aggarwals.  Girija and Rahul are the children of Mr. and Mrs. Gupta. Suresh and Girija married to each other and Rajni, Sushil and Ramayan are their children. Sita and Satya are also married to each other and Prem and Amar are their children. How is Suresh related to Rahul.

XC13 WD,UF15TG, RS17QT, ?

AA40, CD51, GH64, ? , US100

K105, N108, Q113, T120, W131, ?

Age of Nareen is equal to Naveen as they are twins. Nakul is younger than Nareen, Priyanka is younger than Balaji but elder than Naveen. Who is the eldest of all ?