Jawaban:

1. he is listening to a story (do you mean he?)

2. he loves his granparents

3. Doni is visiting her grandparents (do you mean his?)

4. he is sitting on his grandfather's knee (RIP Grandpa's knee)

5. he loves his grandfather's stories

text:

Doni is visiting his grandparents. he loves his grandparents. he is sitting on his grandfather's knee. he is listening to a story. he loves his grandather's story

smoother text:

Doni is visiting his grandparents, he loves his grandparents and is eager to see them. At his grandparents's house when he arrives, he came to his grandfather and sit on his knee, while listening to his grandfather's story. He really loves his grandfather's stories, that is one of the reason he is so eager to meet them.