What is the word or phrase?

There’s a girl who has a large family. She has an equal amount of brothers and sisters, but each brother only has half as many brothers and sisters. What’s the correct amount of brothers and sisters?

Can you divide the below-given shape into four equal and identical pieces?

As shown in the image, the nine Dogs are square fenced. By constructing just two square fences can you make sure that two Dogs cannot meet each other without crossing the fence?

Using Only Five 5's and any mathematical operator make sum as 37

Replace the question mark with the correct number in the below-given picture?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

Only one colour, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

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