What does this rebus puzzle means ?

Two fathers and two sons decided to go to a shop and buy some sweets upon reaching. Each of them bought 1 kg of sweet. All of them returned home after some time and found out that they had 3kg of sweets with them.

They did not eat the sweets in the way, nor threw or lose anything. Then, how can this be possible?

Living above a star, I do not burn
Eleven friends and they do not turn
I can just be visited in a sequence, not once or repeatedly
PQRS are my initials
Can you tell my name accurately?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

What is the fastest way to double your money?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

The answer I give is yes, but what I mean is no. What was the question?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

I am white when I am dirty, and black when I am clean. What am I?

Four cars come to a four-way stop, each coming from a different direction. They can’t decide who got there first, so they all go forward at the same time. All 4 cars go, but none crash into each other. How is this possible?