Who is the real owner of Vera's drawing?

Last Sunday was Vivian's birthday celebration at brother's place. My niece Vera gave us her beautiful drawing of Hello Kitty and Mickey Mouse. Vera could draw very well, and Oliver and Heidi both look up to her. As the biggest jie jie, Vera has natural abilities when it comes to interacting with younger kids. But there is only one big jie jie and one drawing, who own the drawing? Oliver claimed Vera gave to her, Heidi denied it and squealed that the drawing belonged to her.

Now, take a look at the drawing... The 'owner' staked her claim.