Hi After going through your sister s scenario two important problems needs to be tackled. Habit of gambling and taking money in advance for that it indicates psychiatric disorder which needs to tackled first. Second is her Diabetes: For diabetes management patient s active participation is very important, though family support is also important. Though her husband can take opinion of diabetologist against her will, it may not be fruitful. Before head it is really important to take opinion of psychiatrist regarding her gambling problem and neglect of diabetes treatment, she require psychiatric counseling. During whole process she needs family support and active participation of her husband and yourself in treatment.