London: James McAvoy doesn`t know how he has been changed by being a father and thinks he will only find out when his son Brendan grows up.
The `X-Men: First Class’ actor who has 11-month-old son Brendan with actress wife Anne-Marie Duff doesn`t think he can judge how he has changed after son`s birth, reports femalefirst.co.uk.
"I don`t know really. We`ll have to wait and see as it goes on. I think you can only answer that in 18 years time," he said.