John married Nancy carter on 7 Mar 1839 in Rush Co., IN. She was the daughter of Elijah A. and Susannah Cassel Carter.

From History of Gentry & Worth Counties, Missouri, National History Company, Saint Joseph, Missouri, 1892, pp.496-497: John Glendenning, deceased, was the owner of 332 acres of land and lived on section 35. He was born in Brown County, Ohio, December 23, 1818. His father was John Glendenning, of Virginia, and his mother was formerly Martha Askins, a native of Ohio. John came with his father to Rush County, Indiana, in 1825. He worked at home helping to clear up the farm until March 7, 1839, when he married Miss Nancy Carter, daughter of Elijah and Susannah '(Castle) Carter. She was born in Campbell County, Tennessee, October 8, 1818. After his marriage Mr. G. bought forty acres of land and worked out until he paid _for it. He also purchased two heifer calves, and paying for them with money obtained in catching furs. Upon starting for Missouri in 1841, he sold his forty acres, took an old wagon, a yoke of_oxen and a horse. By this time the two calves had grown quite large. After a number of adventures incident to such a life he arrived here September 15, having twenty-five cents left, which he paid to get` a letter from his father in the post office at Trenton, Gentry County, fifty miles from where he settled. He at once made a claim of forty acres, a part of the land where the home-stead now stands, erected a rude shanty and commenced improving the place. When the land came into market he had sold stock enough to pay for it except five dollars, which was borrowed of a friend; As fast as he could gather up fifty 'dollars by work and little trades, selling stock, etc., he would enter an adjoining forty acres. This was continued until he became a large land owner. He soon had one of the best farms in the county and also became one of the best known citizens. Mr. and Mrs. G. had a family of nine children, but seven of whom grew up: Milton, (who married Julia Ann Crane); Daniel, (who married Hannah Crane; he died in November, 1866); William Henry, (married Lizzie Hollinsworth); Emily, (now Mrs. Alfred Stewart) ; Martha, now Mrs. Zilia A. Dunlap) ; Elijah Joseph, (who married Eliza Leach); Minerva Catherine, (who married Arthur Stewart). She died October 7, 1874,leaving two children: Eddie May and Mary Jane, The grandmother, Mrs. Glendenning, has had the care of them since that time. Mr. Glendenning died June 7, 1876. The loss of no man in any community could be more deeply felt. His long and useful life, his kind disposition and exemplary morality in the neighborhood won for him the lasting friendship of all. His death was lamented and mourned by many. Mr. G. professed religion in 1839, and joined the M. E. Church. His zeal for the cause of religion was great, and his gift for proclaiming it to others made him a favorite in the church. Accordingly he was licensed to preach, in which calling his services became very acceptable. His children are nearly all members of the church. He was an active soldier in the Missouri Militia during the war. In politics he was a Republican.
Info from dscott