A source tells People that during Katie's "entire time with Tom, it was never lost on anyone that Connor and Bella do have a mother and her name is Nicole Kidman." (The Aussie stunner has stayed silent through the split.)
Isabella, an artist and Connor, a DJ, are both Scientologists like their father.
As RadarOnline.com previously reported, Isabella had been working for Katie's clothing company until she was mysteriously fired recently.
A source close to the family claims that Bella worked for Katie's Holmes and Yang line and was suddenly terminated for no reason.
"There was never any trouble between them," the source told the Hollywood Reporter. "Bella called Katie ‘Mom.’ She was fired out of the blue, and once Katie filed for divorce, it all made sense. This was a carefully planned ambush. Katie didn’t want Bella working for her anymore because she was Tom’s kid."
The estranged couple said in a joint statement last week that they're "committed to working together as parents to accomplishing what is in our daughter Suri's best interests."
Daddy Day! Tom & Suri Cruise Reunited In