Willie is the white ****atoo that lived with Harrietts parents.

remember the budgie in Harolds room ??

harriett went to her parents and she heard the ****atoo (willie) say something to her using "princess" which is why Mrs Delvecchio Schwartz used to call her

When Harriett asked flo about if they ever truly pass over, flo drew the budgie and the ****atoo. Meaning that they have come back as the budgie and the ****atoo.

Which is why she said she would have to get custody of Willie

Does that make a bit more sense.

Love