Hi! I'm not sure about my english so you might find some mistakes but I've tried to write your story with my words. I hope it is going to be useful for you. ciao

my holiday

last holiday in this summer i am going to visite my grand parents in another city. with my parents and my sisters we are talking about a lot of stories in the past we are visite naturel place .

we eating a lot of eating. and i am going with my cousins to practice sport in imintanout is an place have one cascad(waterfall) and a lot of wather and we seeing ours friend of there cousin .we finish in  at 7 oclock we return to at home for staying and watch news in tv .and tchating with ours friend in social site for exaple vk. if not know is application to communicate with others and sent pics and videos .and you can shards a few of news

I planned to visit my grand parents during my last holiday trip of this summer. My family and myself are often telling stories to each others about what happened in the past when we were visiting natural places. 

We will eat a lot of food and I'm going with my cousins to practice sports in ... which is a place with a waterfall and it's plenty of water. We will meet also my friends of my cousins. We will finish at seven o'clock in order to come back home on time to watch some news on tv and to chat with our friends in a social web chat such as VK. If you don't know this application, well, it permit you to communicate with others, send pictures and also share some news.

my holiday

last holiday in this summer i am going to visite my grand parents in other city . with my parents and my sisters we are tolking about alot of story in the past we are visite naturel place .we eating a lot of eating. and i am going with my cosins to pratic sport in imintanout is an place have one cascad and alot of wather and we seeing ours friend of there cosin .we finish in 7 oclock we return to at home for staying and watch news in tv .and tchating with ours friend in social site for exaple vk. if not know is application to communicate with others and sent pics and videos .and you can shards a few of news

- This summer, for my last holiday, my parents, sisters and I went to visit my grandparents in another city.

- "we are tolking about alot of story in the past" = "we were talking about a lot of memories"

- "in the past we are visite naturel place" to put this in the past tense you would say "In the past we visited a natural place", but I don't know what you mean by "a natural place". Forest? Park?

- "we eating a lot of eating" = "We ate a lot of food".

- "and I am going with my cosins to pratic sport in imintanout" = "I also went to do sports with my cousin in Imintanout" (is Imintanout a place?)

- "is an place have one cascad and alot of wather and we seeing ours friend of there cosin" = "Imintanout has a waterfall and lots of weather. We also went to see my cousin's friend".

- "we finish in 7 oclock we return to at home for staying and watch news in tv .and tchating with ours friend in social site for exaple vk" = "We finished at 7, and came home to watch news on the television and chat with friends on social networks, such as VK".

- "if not know is application to communicate with others and sent pics and videos .and you can shards a few of news" = "If you don't know what that is, it's an app to talk to people and send pictures and videos, as well as share a bit of news".

To put it all together, it might look like this:

For my last holiday this summer, my parents, sisters and I went to visit my grandparents in another city. We talked about a lot of memories, like visiting the park (?). We ate a lot of food. I also went to do sports with my cousin in Imintanout. It is a place with a waterfall, and lots of weather. We also went to see our cousin's friend. At 7 o'clock we finished and returned home to watch news on television and chat to friends on social networks, such as VK. If you don't know what that is, it's an application to chat with others, as well as share pictures, videos, and a bit of news.