What are the rights of a divorced woman and her three children concerning housing and maintenance, and how is the maintenance calculated, given that her ex-husband is well-off?

If the divorce is revocable, she is entitled to maintenance and housing until her waiting period (iddah) ends. However, if the divorce is irrevocable, the preponderant view is that she is not entitled to maintenance or housing. As for the children, their maintenance and housing are incumbent upon their father.