Any divorce settlement would come out of Sumner Redstone's own pocket, and not his family's Boston-based business, National Amusements Inc., said two people close to the firm. National Amusements is caught in a credit squeeze and Redstone's daughter, Shari Redstone, who runs the company, is trying to restructure its nearly $1.6-billion debt load, including an $800-million bank loan that is due in mid-December. Sumner Redstone controls 80% of National Amusements; his daughter holds the remaining 20%. If National Amusements is unable to come to an agreement with bankers, it might have to sell off more shares of Viacom Inc. or CBS Corp., two publicly traded companies that Redstone controls, to pay down the debt.