McAvoy, 37 and Duff, 45, who recently announced their split after nine years of marriage, will both continue to live at their London home with their son Brendan, reported Femalefirst.
"They've decided to stay where they are for the time being and are trying to minimize disruption at home. James will be there for the foreseeable future.
"It's completely amicable and they're still getting on well. So despite all the news breaking, they've decided to keep themselves at their home in London with their son. To all intents, this seems to be the epitome of the perfect break-up," a source said.