If you are in a second or subsequent marriage that involves different sets of children, then you have a blended family.
If you are planning to start a new life, and maybe buy a home with your present spouse, then this time around you really need to develop an integrate plan to ensure that all the important people in your life receive their fair share of your assets after you die. That’s what modern integrated estate planning does.
In most Australian jurisdictions, divorce will invalidate all gifts to an ex-spouse under a Will. However re-marriage will automatically revoke the entire earlier Will (with only rare exceptions).