Sisters Of Mercy Mark 70 Years In Religious Life During A Celebration At Mercy Center In Dallas, Seven Sisters Of Mercy Marked 70 Years Within Their Religious Community. Sr. M. Anne Mccue, A Native Of Crafton, Pa., Has Been Engaged In The Ministry Of Prayer Since 1987. Sr. Anne Taught And Served As Principal In Elementary And Secondary Schools For 27 Years. Sr. M. Dorothea Cahill, A Native Of Parsons, Is Engaged In Prayer Ministry At Mercy Center, Dallas, And Taught In Elementary Schools For 51