Tā wèile qián hé qīnxiōngdì fǎnmù, zhēnshì yǒuwéi tiānlún.
He fell out with his own brother over money, which goes against the natural bonds of family.
Tips
usage
天伦 is the order of family ties that nature (天) sets, between parents and children and between brothers; 伦 is the proper order of human relations, as in 伦理 (ethics). The word is nearly always met in 天伦之乐, the joys of family life.