Mathew S. Rosengart, Spears’s lawyer, has accused James P. Spears of financial mismanagement, along with the estate’s former business manager, Tri Star Sports & Entertainment Group.Mathew S. Rosengart, Spears’s lawyer, has accused James P. Spears of financial mismanagement, along with the estate’s former business manager, Tri Star Sports & Entertainment Group.Read MoreWills and Estates, Rosengart, Mathew S, Spears, Britney, Spears, Jamie (1952- ), Tri Star Sports & Entertainment Group