All perfect praise be to Allah. Blessings and peace be to upon Prophet Mohammad and upon his family and companions.
It is incumbent upon you to pay the Zakkah on the debt sum (33000) JDs. for a lunar year, and that is the one in which the debt was due on your sister, but after she registered half the house for you, the lunar year was cut off, and so no Zakaat is due on it after that since the debt has become a property, and in this case it isn`t Zakatable.
Moreover, it is permissible for the brother to pay the Zakaat of his wealth to his poor sister who doesn`t receive sufficient provision from whomever is in charge of supporting her. In fact, the sister is more entitled to the Zakaat than anyone else for the Prophet (PBUH) said: “Charity towards a poor person is charity, and towards a relation is both charity and maintaining the ties (of kinship)" {Tirmidhi}. And Allah Knows Best.