NEW YORK/WASHINGTON (Reuters) - The father of the money market mutual fund -- investor Bruce Bent -- was charged with fraud by U.S. regulators on Tuesday over accusations he deceived investors into believing his flagship fund was safe before it "broke the buck" last year. The civil charges against the veteran money manager, his son and their investment company come eight months after the Reserve Primary Fund, loaded with Lehman Brothers debt, halted redemptions after the investment bank declared bankruptcy, sparking a run on money-market funds. The fund's net asset value fell below $1 after Lehman's bankruptcy last September, meaning...