My brother is my enemy, what should I do?

He is older than me, and treated me as an enemy from the beginning, since we were little. When our father died, he divided his huge property in two, and left me the worse part (less profitable, and when the property was landed - too tered and not handy to supervise). My brother, his favourite, got the better. I went away to live on my property, and thought that his enmity would p, or at least that he would not bother me. Not so. He quarreled with a powerful man, Hunald, and wanted me to participate in the quarrel, on his side, of course. I refused. I wanted to mind my own business. My brother won the fight with Hunald, and it made him very popular with my employees. He is constantly conspiring with them now, looking for a way to hurt me or maybe even take my property from me. Our mother, Bertrada, sides with him, as he is her eldest "golden boy". She came to visit me at Seltz, and talked about forgiveness and brotherly love and such, and then helped my brother to marry Desiderata, a girl whose parents' property is right next to mine. Now his property and those of his parents-in-law encircles mine, and it's even easier for him to regulate prices, spread discontent among my employees and so on. I feel helpless against their tactics - there is nothing I can legally dispute, yet my brother is fighting an underhand war with me, using underhand means. What should I do?