My first nephew.

My cousin got married last year. She is the first one got married among my cousins. She gave birth to their first child, a boy, 3 weeks ago. His name is Hyun-su. If my grandma were alive, she would be really happy. She had passed away last year. That is a traumatic and difficult time for me. Sometimes I had have a dreams about her. (If you say sometimes, it generally means more than one event. You want to say have instead of had because, sometimes also indicates events that are on-going.)

I hope she is happy in the heaven.

I’m going to see Hyun-su tomorrow. I wanted to buy the cloth some clothes for him, but my mum said to told me “He has too many clothes. Her coworkers bought many clothes for him. I don’t know what the best thing is for him. One of my friends recommended that I will buy him the a mobile (what?).

I will bring my Polaroid instant camera. Maybe it is the first time to take a picture for  of him by using  with a Polaroid instant camera. I will make an album for him ^^ Maybe it is the a good present for him :)

The This photo is of my nephew. I hope he will grow to be healthy and spirited.

My first nephew.

My cousin got married last year. She is the first one got amongst my cousins to get married . She gave birth to their first child, a boy, 3 weeks ago. His name is Hyun-su. If my grandma were alive, she would be really happy. She had passed away last year, and that was . That is a traumatic and difficult time for me. Sometimes I had a dream about her. I hope she is happy in the heaven.

I’m going to see Hyun-su tomorrow. I wanted to buy the some clothes for him, but my mum said to me “He has many clothes. Her coworkers bought many clothes for him." I don’t know what the best thing is for him. One of my friends recommended that I will buy the mobile. (hahaha, that's silly!) I will bring take my Polaroid instant camera. Maybe it is the first time to take a picture for of him by using Polaroid instant camera. I will make an album for him ^^ Maybe it that is the good present for him :)

The photo is of my nephew. I hope he will grow to be healthy and spirited.

I feel there are too many short sentences - you can combine two short sentences into a longer one using 'conjunctions' like 'and', 'but' for example.

My first nephew.

My cousin got married last year. She is the first one got to get married among my cousins. She gave birth to their first child, a boy, 3 weeks ago. His name is Hyun-su. If my grandma were alive, she would be really happy. She had passed away last year. That is was a traumatic and difficult time for me. Sometimes I had a dream about her. I hope she is happy in the heaven.

I’m going to see Hyun-su tomorrow. I wanted to buy the clothclothes for him, but my mum said to me, “He already has many clothes. Her coworkers bought many clothes for him." I don’t know what the best thing is for him. One of my friends recommended that I will buy the a mobile.

(New paragraph)

I will bring my Polaroid instant camera. Maybe It will be is the first time to take a picture for of him by using a Polaroid instant camera. I will make an album for him ^^ Maybe it is the a good present for him :)

The photo is of my nephew. I hope he will grow to be healthy and spirited.