All Creatures Great and Small (1978)

S6E5 Blood and Water

James encounters two elderly twin brothers, Oliver and Roland Strong. While Oliver is a rabbit breeder, Roland has earned accolades for his cabbage-growing skills. The brothers have partitioned the cottage inherited from their mother and haven't communicated in five decades. Recently, Oliver has come to believe that Roland has poisoned one of his beloved rabbits, reigniting their long-standing feud.