Who pays in family flats?

hi, my brother and i inherited  a ground floor unit in a block of 5 built in
1925 in [location withheld- JT]. My auntie owns 3 units and my uncle 1, my auntie has been managing agent since 1986 as well as the chairperson, trustee and secretary. I recently moved in to the unit and found that no maintenance has been done. And the building has major defects that have not been addressed nor has a 10 year sinking fund plan been put in place. Our unit is the one suffering. I got a building inspection done on our unit and the structural walls, supporting walls and common property area have damaged majority of our unit. Due to no guttering or drainage for the building, bitumen damp course no longer effective, no ventilation, rising and lateral damp are just the beginning. Now all these defects need fixing asap. My auntie said to do this we will have raise levies. Will we have to now pay a special levie to fix this or would my auntie be personably liable as the owners corp and managing agent being negligent causing our unit to be depreciated in value and unsellable ?