What are my father's rights in a custody battle when the mom's sister does drugs?

I am in a divorce process with my wife right now and she went for temporary custody of the kids. We already agreed and had notorized every other weekend and 3 hours on Wednesday night and 3 hours on Thrusday night. Judge kept the same time. Judge ordered my ex and I to take drug tests which we both passed. I was ordered a 2nd time to take and I passed again. Judge also recommended sister in law take one to because she was child care provider of 2 kids. She refused because it is was not court ordered. I am shooting for sole custody of the kids based on the fact my soon to be ex has her sister living with her and the sister is smoking marijuana. She also allows our children to be around some neighbors who she calls aunt and uncle. The so called neighbor who she calls uncle smokes marijuana also and has a current case for Domestic Violence. In the state of Arizona is anybody living under the same roof as our kids brought into this? Can they be court ordered to take drug tests? If they fail do my chances get better? Also, my ex is taking percocets, xanax, anti depressant, and muscle relaxer for issues she has. She has a prescreption for all of it, but I believe there is a mental health problem going on. Any advice?