NEW CANAAN, Conn. — As authorities continued to search a local park Thursday for missing New Canaan mother Jennifer Farber Dulos, the contentious two-year divorce with her estranged husband continued, unabated, with his lawyer’s plea to a judge for custody of their children, now holed up under armed guard in his mother-in-law’s New York City apartment.Connecticut state police were continuing their search in Waveny Park in New Canaan on Thursday.