DENISE RICHARDS' sister MICHELLE MCLAUGHLIN claims Charlie Sheen's parents are far from doting grandparents to the estranged couple's children. The Platoon actor and his wife are currently embroiled in acrimonious divorce proceedings, with Richards claiming in legal papers the actor was obsessed with internet porn and gambling and made threats towards her and her family when Richards first decided their marriage was over last year (05). And Martin Sheen, who plays the US President in The West Wing, recently urged the warring former lovers to end their bitter war of words for the sake of their children - two-year-old SAM and 11-month-old Lola. But MCLAUGHLIN insists Martin and his wife Janet are usually too busy to spend time with their grandchildren, despite having every opportunity to be with them. She tells Star magazine, "I can count on one hand how many times they have chosen to see the girls."