De facto spouses, your cohabitation agreement could include provisions concerning the contribution of each spouse during their life together and, in the event of separation, the child custody, the partition of property and many others.
Your living will allows you to choose the type of medical care you wish to receive towards the end of life.
The protection mandate allows you to choose who will take care of you and your property if you become incapacitated.
Your Will allows you to choose to whom you will pass on your property upon your death.