Houston of Billerica, formerly of Woburn, January 23, 2010, Mark R. Houston, age 47. Devoted father of Kyle and Courtney Houston, both of Billerica. Son of Shirley and Ralph Butt of Litchfield, NH. Brother of Robin Kelly and her husband David of Litchfield, NH and Allan Houston and his wife Karen of Newburyport, MA. Stepbrother of Darlene Butt of Newbury, MA. Also leaves many nieces and nephews. Family and friends will honor and remember Mark�s life by gathering for calling hours at the Burns Funeral Home, 354 Boston Road, (Rt. 3A), Billerica, on Saturday, January 30 from 10:00-11:30 a.m. Visitation will be followed by a memorial service at 11:30 a.m. In lieu of flowers, donations in Mark's name may be made to Shriners Hospitals for Children, 99 Fordham Road, Wilmington, MA 01887.