"Willing to share" means agreeing to both people using it together or passing it back and forth after a short time. "To give it to him" may not mean sharing, just passing the Ipad to him.
Some other things to watch is that you have written with a bad mix of verb tenses. Try writing it all in the past because it seems this was a past event. I'm not sure if Joey is a boy or girl - I'll assume boy.
Joey brought his iPad to his cousin's house to play.
His cousin's daughter wanted to play with the Ipad but Joey was not willing to share with her ..or.. was not willing to give it to her.
Joey was frustrated after his cousin scolded him.
Student or Learner