Preposition "to"

1. “It will mean also the end to my life

2. The interesting aspect to this debate is the price difference between some drugs in Canada and some drugs in the United States.

3. The interesting point to this is that the letter was written in August,

4. There is actually some distant possible truth to what you are saying

5. ?The truth to this is staggering

6. What is the story to this game?

Q1) By googling, I have found all the sentences above, but I'm not sure whether "to" is correctly used.

Q2) Is "to" used for meaning "belonging to" or 'given to" in all the sentences?