[anobserver]

Generally speaking .... wills can be contested by estranged family members, but ... The legal advice i received applying to Qld was that it quite defensible to write out parents or siblings if you choose to do so.

It is more difficult to deny surviving children a share, but that isnt the issue in this instance. Defacto relationships ... well after six years together i imagine that would likely be treated like a marriage.

For peace of mind get some advice and get a will drawn up. Its worth doing.