I Want to Get Involved in My Sister’s Drug Treatment Program. What Rehab Has This Kind of Program?

We live in Brookline, Massachusetts. I just think my sister would recover faster if I get involved in some counseling or therapy sessions, as we are very close. She’s reluctant to go into inpatient rehabilitation, so I really want to be there for her as much as I possibly can. Can somebody help us find a rehab that will allow this?