Can someone challenge my Will?

You are legally entitled to leave your assets to anyone you wish, however friends or relatives who believe they should have been but have not been sufficiently provided for are entitled to contest your Will.
People who can contest your will include your current or former spouse, your children, de-facto partner or ex-partner or any other dependants. That person will need to convince the Court that you failed to make adequate provisions for their maintenance, education or advancement in life, where you should have reasonably done so.
Your solicitor will be able to advise you as to how best to structure your Will to minimise the chances of the Will being contested.