Explain the cause of the feud between the families of Ulrich von Gladwitz and Georg Znaeym?

The Gradwitz and Znaeym families are long-time enemies. Many years ago the families battled in the courthouse over rights to a strip of land. The Gradwitzes ultimately prevailed though the Znaeyms refused to recognize the court order. Consequently, generations of Znaeyms continued to trespass onto Gradwitz land, claiming they’ve been unjustly dispossessed. Ulrich Gradwitz and Georg Znaeym inherit this animosity and are born enemies. They feud as boys and war as men.