Cutting off relations with the uncle and regretting it later after his death
A:
You were mistaken to sever ties with your uncle and to stop talking to him. You should perform Tawbah (repentance to Allah); may Allah accept from you and us!
Try to do much good to your uncle, by seeking Allah's Forgiveness for him, supplicating for him, giving charity on his behalf and keeping good relations with his children and relatives. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.