Singer Nick Lachey insists the constant presence of estranged wife Jessica Simpson's father Joe put a strain on their marriage. Simpson's father and manager has publicly admitted that he didn't want his daughter to marry so young. Lachey explains, "I don't know if he ever even liked me. To this day I couldn't say. It was painful." The former 98 DEGREES singer admits it was difficult for the couple to mix business and personal relationships when dealing with the elder Simpson. He explains, "I don't pretend to understand Joe. "Do I think Joe drove a rift between us? No. "Was he an influence in our marriage? Absolutely."