Since you are not legally recognized as Steve's wife, if something were to happen to him or if he or you decided that you no longer should be a part of the family you have no legal recourse other than child support if you have children with him.
If you go back and read my posts you will see I actually have a lot of rights. Part of being here is I had to meet with the church lawyer and sign somethings that made me a equal partner in everything here so if things came apart I would have some money or if Steve died the other wives could not just kick me out. They would not do that but the church has had problems in other families so they do this to make sure everyone is protected. Being on child support would attract attention from social workers and the church does not want that so there are some strict rules about money and husbands and wives all being equal partners in everything.
The one family that did break up a long time ago this rule made sure the wives and their kids were protected and then those wives ended up joining other familes so they were taken care of. And then like Steve and Shari there parents might move in here someday so we can take care of them and then I have a right to have my mom here someday if I want.
I really do not have anything to worry about.