Justus married Tranquilla Ann Brady, daughter of Lindsey Anderson Brady and Elizabeth Ann Hendrickson, on 29 Jun 1921. (Tranquilla Ann Brady was born on 22 Jan 1846 in Nauvoo, Hancock, IL, died on 4 Jul 1941 in Salt Lake City, Salt Lake, UT and was buried on 7 Jul 1941 in Fairview, Sanpete, UT.)