Diabetes isn't the 3rd member in my relationship, but it was the 4th member of our family (for a while, that is...). Our [immediate] family used to consist of three: my husband, myself, and our daughter. Then we were forced to "welcome" a fourth member, my then-11-year-old daughter's Type 1 diabetes. This fourth member was so demanding and it succeeded in coming between two relationships: my relationship with my husband, and my daughter's relationship with her father. My soon-to-be-ex-husband's selfish apathy, complete lack of motivation to learn much if anything about our daughter's life-altering disease, and refusal to do even a small part of her diabetes care despite the fact that he is unemployed and I work 50 - 70 hours a week, resulted in an insurmountable amount of hurt and anger, both for my daughter and myself. In a way, I have my daughter's Type 1 diabetes to thank for being the last nail in the coffin that my marriage had become. Now our family is back to having three members: myself, my daughter, and her Type 1, and we are undeniably happier all around.