I posted this in another thread
CS5 Extended $201inc GST for education.
Student and Teacher Edition eligibility
This software may be purchased by:
- University and college students—students enrolled at a higher education institution defined as an accredited public or private university or college (including community, junior, or vocational college) that grants degrees requiring not less than the equivalent of two years of full-time study
- Primary and secondary school students—students enrolled at an accredited public or private primary or secondary school providing full-time instruction
- Faculty and staff—teachers and staff employed by an accredited primary or secondary school or public or private university or college
So, if your children are at school, then you can buy it for home family use.