Michael Jackson’s much-ballyhooed London shows may not go on, if lawyers for his family’s tour-in-the-making get their way. AllGood Entertainment - the company that is putting together a series of concerts with Michael Jackson, Janet Jackson, and their brothers - has fired off a cease-and-desist letter to the people organizing Jacko’s London concerts in July. Apparently, back in November, Whacko Jacko’s manager Frank Dileo signed a deal that promised Jackson would do the family tour. As part of the deal, the King of Pop was to refrain from any other concert deals for 18 months. Jackson’s attorneys claim that Michael never signed the family-tour agreement and his manager did so without his knowledge.