* No biological children: Some foster parents choose to focus solely on fostering.
* Biological children: Some foster parents have their own children in addition to foster children.
* A variable number of foster children: Foster families can care for different numbers of children at different times, depending on the needs of the children and the capacity of the family.
To answer your question accurately, you'd need to specify which foster parents you're asking about.
Is there a specific foster family you're curious about?