Sheen teaching sons the word 'rehab'

Charlie Sheen has been teaching his two-year-old sons how to say the word "rehab".

The troubled former 'Two and a Half Men' star - who was fired from the sitcom after a fallout with co-creator Chuck Lorre over his drug taking and partying with porn stars - has revealed he is trying to expand twins Bob and Max's vocabulary so they understand where there mother Brooke Mueller is.