As far as census went, the earliest census (1830) shows only a Richard Maddock in Perry County. (surname soundexed)
Another subscription site I found a book on early Perry County marriages.From that, a number of children of Richard show up, as well as one fellow shown whose mother was a Judith Miller (no father shown), then later a bride whose father was a Thomas Maddock.I'm sending all this over to you below.
ALL taken from " Marriage records, Perry County, Missouri : book "A", 1825-1841 Woodruff, Howard W., Kansas City, Mo.: Mrs. H.W. Woodruff, 1971, 59 pgs. "
Page:page in book page:assume to be page # in county record book.
Page 9 page 38,6 Sept 1831Richard Maddock - Cecilia Miles g25y, son of Richard Maddock & Elizabeth O'Connor b31y, dau of Joseph Miles and Ann Wathen Wit:John Layton & Mary Miles
Page 11 page 46:11 June 1832John Layton - Marcella Maddock g27son of John Layton & Monica French b 197, daughter of Richard Maddock & Elizabeth O'Conner With Pius Spalding & Matilda Layton
Page 12 page 48:31 July 1832Daniel O'meara - Elizabeth Maddock g 31y, son of James O'Meara & Elizabeth Carroll b 20y, dau of Richard Maddock & Elizabeth O'Connor Wit:John Dougherty & Ann Maddock page 49:31 July 1832james Layton - Mary Maddock g 30y, son of John Layton & Monica French b 24 dau of Richard Maddock & Elizabeth O'Connor
Page 15: page 67:31 Mar 1834Felix Simms - Ann Maddock g 20y, son of Thomas Simms and Susann Manning, consent given b19 y, dau of Richard Maddock & Elisabeth O'Conner Wit:Pius Manning and Mariah Layton
Page 35 page 173:Richard Maddock - Elizabeth Hatter g (son of) Judith Miller b daug of Henry Hatter & Ann Cox Wit:John B Moranville & Daniel Omeara
Page 38: page 193:9 Feb 1841Thomas Maddock - Lucindia French g son of Thomas Maddock & Mary Comins b dau of Charles French & Elizabeth French Wit:John G Duvall & Matildia French