I went mom's grandma house in weekend.

>>I went to my  grandma's  house last weekend. 

My mom's grandma house is in the country.
>> My grandma's  house is in the country.

So I play With  cousin in the lake.
>>So I played with my cousin in the lake.

I catch a fish and tadpoles very many. So I bring it in my house.
>> I caught a lot of fish and tadpoles . So I brought at home.