Mickey Rooney : His children

His children

According to IMDb, he had 9 children. The NY Times obit does not mention any of them as his survivors, only his widow, Jan Chamberlin. Does anyone know if he was estranged from his children? Seems odd of the NYT not to mention them.

http://www.nytimes.com/2014/04/07/arts/mickey-rooney-master-of-putting -on-a-show-dies-at-93.html?hp&_r=0