Law / Dying in Poland - Inheritance tax ? [62]

My situation is my brother and I have lost our mother. She owned 3 flats including one I live in and a share of some land. Do I have to pay inheritance tax? I only have a low paying job and don't know how I will pay the tax. My brother is quite poor too and struggles with his family bills.

Will I get time to raise the money to pay the inheritance taxes?

Any advice would be welcomed.

(My father passed away many years ago.)