“The contract is already drawn up and ready to go,” an insider confirms to In Touch. “Lynne’s not sure marriage is a good idea, but she’ll go along with that if that’s what Jamie Lynn wants — as long as Casey signs the contract.” A Spears family confidant says that Lynne, who flew home to Kentwood, La., to celebrate Jamie Lynn’s April 4 birthday, is worried about Casey. “He doesn’t seem as committed to the relationship as Jamie Lynn,” says the confidant, adding that the family is aware of the rumors that he’s cheated. “Lynne is keeping an eye on him.”