River

I went to cousin's house with my brother and his friends. We planned to fish, as I was renting fishing rods from my brother's friend.
Pajar drove the car, the others and I were joking around until we arrived. I think it was 2 hours from my home to my cousin's house.
I didn't know where is the river was exactly and my cousin told me it was near close. It is was behind cousin's their house, but we had to walk to get there.

I jumped the boat, I am lucky the boat wasn't capsizing. We were fishing from morning until evening. We had great time in there, but I didn't catch any fish because the fishing line had been empytied.

CORRECTIONS:
'is', 'are' and 'have' are present tense words. 
You are talking past tense, therefore it would change to 'was', 'were' and 'had'

When you speak of other people recently. You can refer to them as 'they' if they are 'doing or have had' or 'their' if referring to something they own. 
 
Hope that helps