There is nothing wrong with
keeping good relations with your disbelieving brother through money and presents, particularly that he supported you in many situations. This requires that you give him something in return. Allah (Exalted be He) says,
Allâh does not forbid you to deal justly and kindly with those who fought not against you on account of religion nor drove you out of your homes. Verily, Allâh loves those who deal with equity.
(Part No. 25; Page No. 380) May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.