Charlie Sheen is trying to focus on being a single dad. The 58-year-old actor – who decided to give up alcohol and drugs in 2017 after struggling with addiction – has stepped away from the spotlight in recent years and is now raising his twin boys Max and Bob, 14, full-time because his ex-partner Brooke Mueller is having some personal issues of her own. Asked what he is doing most these days, he told People: “Single dad stuff. I’ve mostly been raising my 14-year-old boys. Their mom has been trying to figure some stuff out on her end, so she’s not in the picture too much right now. They’re real…