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inherit property in Spain

Advice please, maybe someone knows - how to make inheritance in Spain? My dad died, the apartment is not far from Alicante, the owners of it, my mother, my sister and I. As we now proceed? I understood that we must provide document from the Russian notary public on who the heirs, but it will give him only six months. A tax on isnaskomu law must be paid before and six months later we have to roll fine. We have something in utter confusion.