If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

Alpha is Beta's sister.

Gamma is a Beta mother.

Delta is Gamma's father.

Tango is Delta's mother.

Then,

How is Alpha related to Delta?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

What can go through glass without breaking it?

Can you spot what's wrong with the following sentence?

PETER WAS ANGRY AT
HIMSELF BECAUSE HE
ACCIDENTALLY LEFT THE
THE KEYS TO HIS CAR
AT HIS FRIEND'S HOUSE.

I have Rs.50 and I spend it in the way as below.

Two friends were betting. One said to the other, "The coin will be flipped twenty times and each time the coin lands on the head, I will give you $2 and each time it lands on the tale, you will give me $3." After flipping the coin twenty times not a single penny was exchanged among them.

How many times did the coin land on heads?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

Can it be possible to build a house that has all its four walls facing towards the South?

Be active and find the killer in the picture Riddle below.