This is what son James said in an interview:

: ‘My relationship with Heather was not very good. I didn’t like her. But I wouldn’t want to say anything negative about her because she’s a good mother to Beatrice and that’s the most important thing. Beatrice is adorable. She’s great, a real joy for the whole family.’

...Later his face breaks into a broad smile when he talks about his stepmother, Nancy. He recently bought his own home in North London and says Nancy is planning to help him decorate it.
‘Nancy’s my new mother. I feel that. Definitely. She’s very genuine. I knew her a year or so before she married Dad. She has been one of the biggest supporters of me doing this, pursuing my own dreams. She wants me to have my own career. She makes Dad very, very happy. We all adore her.