Charlie Sheen is planning to look after his twin sons full-time following the arrest of his ex-wife Brooke Mueller.

The former Two and a Half Men actor currently shares custody of two-year-olds Bob and Max with the reality TV star, but is set to take charge of the boys, along with Brooke's parents, as they are concerned about the welfare of the boys.

Charlie, 46, has just returned from a trip to Colombia and will start looking after Bob and Max once they return with Brooke to California from a visit to Aspen, Colorado, where she arrested on Friday night. Charlie and her parents want her to enter rehab to get help for her troubles while they care for the boys. However, Brooke - who could face up to six years in jail after being charged with assault and intent to distribute drugs - is refusing treatment as she doesn't want to be away from her children.

But friends say Brooke needs to be in rehab for "at least nine months" and has reportedly been told spending anything less inside a treatment facility would be a "total waste."

"Brooke has done rehab on her terms in the past - 30 days isn't enough for an addict like Brooke. Brooke is calling the shots, and not listening to her family, or medical professionals that are telling her she needs to be at an in-patient facility for at least nine months, and not as a day patient, as she has done in the past. Anything less than nine months is a disservice to Brooke, and frankly, is a total waste," said a source close to Brooke, who has battled addictions to drink and drugs for much of her adult life.

It is thought Charlie posted the $11,000 bond for Brooke's bail after her parents refused to help her. She must return to a District Court hearing on December 19.