They knew Eva as their 82-year-old dad’s private banker, a woman with an Eastern European lilt, an affinity for Van Cleef & Arpels jewelry and a husband, Jonas. Sometimes the Gayers would bump into the Judelsons during the family’s Sunday night meals at Gino’s on Manhattan’s Upper East Side. On a couple of occasions, the Gayers had attended an art opening at a Chelsea gallery owned by the Judelsons’ oldest, Paul.