BBM, If we can believe this article then William very much knew his mum & dad.
(quote)
Natalie said a last-minute change to William’s plans was made which placed him at the house from where he was abducted.
She also revealed William’s very close relationship with his biological father, even after the boy was removed from her son’s care.
On the last occasion Brendan Collins and William’s mother Karlie Tyrrell saw their son,
the three-year-old clung to Brendan and cried “Daddy, Daddy, Daddy, I love you,” Natalie told news.com.au.
http://www.news.com.au/lifestyle/pa...d/news-story/1a73063218a15527c703ad7d2136710e