I live with one of my brothers. My salary is small and I do not share in the house expenses, and if I buy something for the house, my brother insists on paying me for it.
I fear that there may be a sin on me regarding this matter. Please advise us. May Allah reward you the best.
If the reality is as you mentioned, there is no sin on you since your brother does so willingly as long as you live with him.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.