London, June 1 (IANS) Actor 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.