If Rajina's daughter is my daughter's mom, who am I to Rajina?

A Detective reviewed the information they had on the case so far.

A lady named 'Caterina' was found shot and they already had a list of suspects - Ankit, Tarun, Harish, Manoj and Manish.
The killer is a fan of challenges him by leaving notes ad various places.
* The first was found in a toilet room.
* The second was found in an art room.
* The third was in a restroom.
* the fourth in an underwater room.
* The fifth at the no-smoking room.

All of the notes read the same thing, 'The clues are where you find the notes.' Yet, nothing was found at any place the notes were.
Detective the genius, immediately solved the case.
Who was the killer?

What does the below rebus riddle means?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

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?

What does it mean?

When 99 is considered higher than 100?

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

What month of the year has 28 days?

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