If my father, mother and brother are the owners of a house (as in its in their name), in the % of:

25% father

25% mother

50% brother

With consent of all 3 of course, how do we go about making the property to be owned in this ratio

25% father

25% mother

25% brother

25% me

Are there stamp duties or taxes to pay? If so, approx how much would it be if the property is worth AU$500, 000

We are in Australia.

Any help would be greatly appreciated!

its a holiday house