Father is Fuller Ryan (b: 1798 d: 1860), Mother Nancy Brakebill (b: 23 Jan 1800 d: 25 Sep 1860), The others you have listed I believe are brothers to Morgan not nephews.
Morgan Ryan fought in the Seminole Indian War in Florida in 1836 with the Talbott County Tennessee Volunteers. He filed Indian Wars Survivors Application #994 for pension as an Indian Wars Survivor.
He sold land in Polk County for $1200.00 on 6 November 1877.
In 1889 at age of 71 Morgan Ryan's personal discription is as follows: 6' 2" in height, light complexion, black hair, grey eyes. This comes from his Indian War application file. In 1890 his personal discription is as follows: 6'1" in height, weight 231 pounds and 73 years of age.
In Goodspeed publication for Cedar County MO 1889, he was still living at that time says that Morgan and Susan left TN in 1848 and emmigrated to Lawrence Co. MO. Then in 1850 moved to Johnson Co. MO. In 1856 came to Cedar Co. MO where Susan died in 1884. Morgan Ryan was a soldier in the Seminole War
(called the Florida Indian War) and a member of the Methodist Church.
In Morgan Ryan's Indian War application file, he mentions that he was maried to Susan J. Patton in Jefferson Co. TN on the 29th day of August 1837 and that his present wife on 22nd of August 1892 is Caroline G. and that he has lived in MO since 1844
Morgan Ryan enlisted at Snodgras' Muster grounds, TN on or about 24th day june 1836. for the term of One year and was honorably discharged at Athens, TN on the 30 day of July 1836. That Morgan was a Private in the company commanded byu Captain John Talbott regiment of Tennessee Militia in the Florida War Indian War of 1836. After Captian John Talbott wa promoted ot lthe rank of Major, said company was commanded by Captian Frank Newman.
It was while the company was on the way to Athens, TN and at a place called Louden on the TN River in TN that a Cherokee indian was with the company who could throw a hatchet with great accuracy while riding in a circle which Morgan saw. Morgan said he was going to try throwing a hatchet while riding in a circle. So he did this on his very one mare horse that was a little high spirited and a gook runner. While practicing this, Morgan was thrown against a tree and badly injured. Some say that he was liquired up. Some say that many told him not to do it. He was then carried over to a private home of Col. Johnson. Recuperated and to rejoin his company when well, which he did finally in about 15days at Athens. TN.
Survivors Pension Form in his Invalid Pension File, show that he was issued a Bounty Land Warrant No. 67, 931 for 160 acres issued May 18, 1855 and Morgan enrolled on June 24, 1836 at Dandridge. Service record shows his service from enlistment date July 8, 1836 and honorabley dischared July 31,1836at Athens, TN which was said to be 75 miles from his home. These records show he was in service 24 days.
The Affidavit of Claimant By Morgan Ryan for service in the Seinole War states that Morgan Ryan lived in.
Cheeks Cross Roads, also Jefferson Co, Tn 1845-1847
6miles from Morristown
Lawrence Co. MO 1847-1849
Cass Co. MO 1849-1852
Johnson Co. MO 1852-1857
Cedar Bluff near Texas Co. MO 1857-1861
New london City, Henry Co IA 1863 18mts
Washington Co. Ia 1865-1865
Bolivar Polk Co MO 1864-1866
Humansville Twp Carroll Co. MO 1870 - Per Census
Eldorado Springs Cedar Co. MO 1883 invalid pension file
More when I get a chance to dig a bit more.