Greenberg Traurig has become enmeshed in a bitter family feud between two sisters, one of whom is married to a senior partner at the law firm. The estranged sisters, Linda J. Spector and Barbara Berlin, had both been named beneficiaries of a trust created in November 2003 by their mother, Eleanor Spector. Eleanor and Linda served as co-trustees until Eleanor's death in January 2004. Shortly after her mother's death, Linda sought to have her then-fianc, Albert Jacobs, the senior chair of Greenberg Traurig's national intellectual property practice, appointed co-trustee, arguing that the successor designated in trust, attorney Joel Sankel, had told her over dinner he would step aside. But in a decision issued last week, a Manhattan appellate court sided with Sankel, who had argued in a petition that Linda Spector and Jacobs might be seeking to control the trust in order to effectively disinherit Berlin.