Please ID this bird - juvenile being fed by currawong

Hi everone,

this is my first visit here. We have had a large brown juvenile bird in our neighbourhood lately which is being fed by a currawong. I don't think the youngster is a currawong itself, as it is already much larger than the bird feeding it. It has a lot of cream/light brown/light grey on its neck, head and body, a different shaped beak, and black and white under its wings.

(I have no idea how to put in a photo, so hope this works).

I live in Ashfield, Sydney.

Any ideas what this could be?

Thanks in advance