car title
have a car with both names in mine is first exgirl friend is 2nd and i bought the car and have bill of sale now she lefted ans took the car and went out of state. who has more conroll of car? and can she take it out of state where she moved

My children’s future
I am now married and have two chilren from a previous relationship. I was never married to my childrens father. He does not pay child support because he won’t keep a job, he lives at home, he has been to prison a few times and he still thinks like he did when he was 17. He is not responsible enough to take care of my children for 2 days every other week, let alone for the rest of their lives if something ever happened to me. I want to write a ”living will” stating that if anything were to happen to me custody of my children would go to my husband, not their biological father. There is no court ordered custody, I have sole custody of them. He has been to jail for not paying child support. My question is, am I able to do this and would my childrens father be able to fight my now husband if that situation happened, for custody? And also, what procedures to I have to take to accomplish this, if able?
Thank you.