Charless W. Neff; 63; of Boundary Street; Monongahela;died Wednesday;Aug.18;1999;at his home.  He was born Dec.25;1936;in Sunnyside;a son of the late Kenneth Neff and Alice Susan Davis Neff;who survives and resides in New Eagle.  Mr.Neff was a member of the First Church of the Nazarene of Monongahela.  He was retired from the Structural Iron Workers Union Local No.3 of Pittsburgh.  Survivors;in addition to his mother;include his wife;Wanda Morris Neff;with whom he celebrated 42 years of marriage on April 27;1999;three daughters and sons-in-law;Pamela and Mike Thieret of Monongahela;Debra and Bradley Kolessar of North Charleroi and Kimberly and Bill Iams of Monongahela;a son;Kurt W.Neff of Monongahela;four grandchildren;Carrie Wilson;Leslie Wilson;Josh Iams and Kristyn Iams;a great-grandchild;Tyler Thomas Stickel;two brothers;Kenneth Von Neff of New Eagle and Gordon Neff of Upper St.Clair;and a sister;Linda Hamilton of Finleyville.  Private services were held Friday;Aug.20;1999;in the Belle Vernon Cemetery Chapel.  The L.M.Frye Funeral Home Inc.;Monongahela;handled the arrangements.