Yes. The very first place that tax avoidance should be addressed are the family trusts. These are numbered incorporations, generating passive investment income, done so with no other purpose or intent but to avoid and reduce taxes of the truly wealthy by sprinkling tax favoured dividends on heirs. 

This in contrast to legitimate active income generating businesses that incorporate and provide income and dividends to family members with a vested interest. Its pretty clear which should be done away with first.