What will you call your mother's brother's brother-in-law?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

We know that money can be names differently for the purpose it is used for. Some of the examples of money given at following places or for following activities:

In temple = Daan
In school = Fees
During marriage = Dowry
For divorce = Alimony
Paying government = Tax
In court = Fine
Employer to employee = Salary
To kidnappers = Ransom
For illegal reason = Bribe
To civil servant retirees = Pension

Do you know what do we call the money a husband gives to his wife?

What work can one never finish?

You bought me for dinner but never eat me. What am I?

A father's child, a mother's child, yet no one's son.

Who am I?

I am an odd number. Take away a letter and I become even. What number am I?

Consider this about a word: The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?

Take one out and scratch my head, I am now black but once was red. What am I?