Is it permissible to deduct the children's contributions to building the house, the expenses of the father's treatment, and the money stolen while the father was accompanying treatment, from the share of the half-sisters? And do they have a share in the house furniture that the mother bought with the children's money?

Issues of inheritance involving disputes among heirs should be brought before the Sharia court or to someone qualified to arbitrate, so that all parties can be heard. Your half-siblings have the right to claim their share of the house; either you purchase their share from them, or the house is sold. The furniture that your mother bought with her own money is not part of the inheritance. Your claims of participating in building the house, or in the treatment of your father, or that money was stolen from you, require lawful evidence. Nothing should be deducted from the inheritance merely based on a claim.