The phrase "joint heirs" means that two or more people share equal ownership and inheritance of something, usually property or assets. They inherit or own it together and have equal rights and responsibilities. Full definition
What characterizes egalitarian marriage is that spouses make decisions together, as joint heirs of Christ's kingdom. (rachelheldevans.com)
During that time, the 144,000 heavenly joint heirs will be judges and will rule «as kings with the Christ for a thousand years.» (religion.blogs.cnn.com)
Very often it is also necessary to represent an inheritor against the other joint heirs, when they could not find an agreement about the property; a public auction by court can be then a solution in those cases. (lawyer-monthly.com)