Paying the House taxes on property does not give anyone ownership rights. Ownership of a property is transferred by way of a deed.
As per you the house was partitioned among brothers after the death of their father . It may be by way of Oral Partition among brothers and further your father came into the possession of the same after his retirement but it is clear that he was having his possession from date of Partition of the property.
Oral partition is valid in the eyes of law provided that the parties to the same stick to it and agree to it and uphold it.
Hence ,it is clear that your father was owner of the property in his possession by way oral partition and that was the cause , he was paying house tax gently and further after his death his legal heirs ie. you and your sister become the share holder equally as per Hindu Succession Act .
You should apply to Registrar for getting the documents of the said property by showing the house tax bill and other address proof of the said property in possession .
Further , after getting the documents apply for LR certificate from the Municipal corporation or authority.
Further ,to create a documentary record, you both can registered a Partition Deed/Family settlement Deed. This deed has legal value in the eye of law and even Bank sanctioned loan on this deed as well , So this document is also valid to transfer the property to purchaser..
Succession Certificate is only for movable assets.