Is what the mother said, "I have forgiven you in this life and the Hereafter, and I am pleased with you," considered proof of the lifting of the severing of kinship ties?

Obeying parents in divorcing one's wife is not obligatory unless there is a legitimate Sharia reason. If they ostracize the questioner for this, they have done wrong. The questioner has done well in honoring his mother and maintaining ties with her through financial support. He bears no blame for her rejection, and he should continue to maintain ties with her and show her kindness. His mother's satisfaction with him and her prayers for him are a great blessing that necessitates increased dutifulness and maintaining ties. The questioner must also be keen to maintain ties with his siblings and treat them well, even if they cut him off or mistreat him, for the one who maintains ties is not the one who reciprocates, but rather the one who maintains ties with his kin when they cut him off.