The Bihar estates of the Csáky family were still received from Sigmund of Luxembourg, and they became the ancient, shared estates. When their headquarters were transferred from the Principality of Transylvania to the Kingdom of Hungary in the 17th century, the estates in the Uplands and Transdanubia gained more importance. In the middle of the 17th century, Count László Csáky returned to Transylvania and established the so-called a Transylvanian branch that possessed the Bihar properties undisturbed until the middle of the 18th century. Then, during the bishopric of Miklós Csáky in Oradea, the members of the upland branch regained the manors, and after a short time, those manors were pledged again to the Transylvanian landowners. However, from 1784 they were finally taken into their hands, and from the first years of the 19th century, the members of the upland branch shared them among themselves, trying out joint possession. The family correspondence contains writings from the trustee contacting his widow after the death of János Csáky, the principal representative of the upland branch, the director of the family. From this, we can get additions about the intention and plans on the division of the estate. And also, on the basis of the three letters published here, about how the best manors got into the hands of Mrs. János Csáky (Jozefa Zichy), and what the role of the property manager was in this.