Can the families speak English?
That depends on the family. Generally there is at least one family member who speaks enough English to communicate, though that may be a child. Children often have been attending Australian schools for long enough that they are able to speak English quite well, though often have difficulty reading and writing it. Many of our parents do not have good English, and tutoring is an invaluable opportunity for them to practice their English conversation skills. Most parents are or have attended a TAFE English course, and all school-aged children are attending school.