The vast majority of joint tenancies in California are used as a will substitute among family members, according to the California Legislature. In a joint tenancy, the surviving member among the title holders will inherit the property. An alternative method is to hold the property as tenants in common, in which case each party owns a percentage interest in the property.
Most of the time when someone is residing in a residence/commercial space as a tenant there is a lease or rental agreement in place. However, at times there may be neither. In these cases, the law will likely support a finding that the tenant is a month-to-month “tenant at will”. This is the default category for tenancies not supported by a written lease agreement in which the occupying party was initially welcome on the premises.