You mentioned that you grew up in a family of drinkers? Does that include your mother? Just because the rest of the family can keep a handle on drinking for whatever reason does not follow that your sister will be able to do so. I'm just wondering, apart from you, what role models she has had, and continues to have, to show her the perils of drinking too much on a daily basis? As your mother is already running the business is there anyway your sister might be able to attend an outpatient or inpatient rehab? Is there anyone who could look after her kids temporarily? Maybe you in the kids summer holidays?