Yesterday three different clients asked me the same question. They wanted help with a tough relationship that is driving them nuts. In each case I reminded my client that they were in fact, nuts.
Each was attempting to change another adult in their life. Regardless the relation, this is a recipe for becoming mentally ill. You cannot make another adult change. You can, however, change your relationship with them. Remember, mental health 101 is all about focusing on what you can control; yourself. Naturally we are all self centered and other controlling. Watch any normal babies and you’ll see it loud and clear…
Second nature is the one you want. Build yourself into an adult that is not a baby and not normal. Become CORE centered and self controlling. This will require you to STOP focusing your limited attention on fixing other adults. And, instead make changes within you, which by the way are within your control. Your relationships will get better at the same rate you do…
Build your CORE. Build your self discipline. STOP acting like a baby. Life is hard. Get on with it. I feel better already…
BUILT TO LEAD 
LOVE that one line, Chet: “Your relationships will get better at the same rate you do.” Fantastic synthesis of BTL in one line. (Did anyone ever tell you you were a genius? Okay, maybe only your Mom…now add me to that august group)! Love, Sully