Maine’s highest court heard oral arguments on Thursday in a case that could end a long-standing family feud over the estate of Robert R. Young, who owned Young’s Lobster Pound in Belfast. At issue is a ruling from a lower court that recognized a will written by Young in 2000 instead of a handwritten document that Young wrote the night before his death that drastically changed who would inherit his assets. Jennifer Eastman, a lawyer for one of Yo…