Did any Michael landons brothers appear on bonanza?

According to Betty Endicot, stand in for Pernell Roberts on Bonanza, Roberts and Michael Landon had a warm reunion on the set of Trapper John when TJMD was filming at a real hospital where Landon's mother was a patient. He came in to visit her but saw Endicot, also working on the show and Roberts waiting waiting for their next shot. According to her, he surprised Roberts who jumped up in surprise when he saw him and the two embraced warmly and had a long visit together. Roberts had also visited the Bonanza set a few times after he left and saw all the cast members including Landon.