More Information:

About Edmund Murrell:

There is an Edmond Murrell in the 1840 Census, TN, Haywood Co., which may be this Edmund Murrell. It lists: male 30-39, 2; male 5-9, 1; male under 5, 1; female 20-29, 1.
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Edmund Murrell apparently moved his family to Texas from Tennessee around 1844.
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A will of George Martin of Harrison Co., TX, dated 19 February 1846, lists a daughter, Sarah (who was by that time deceased) as one of his children. The will mentioned as Sarah's heirs three sons - Robert Murrell, William Murrell, and Edmund Murrell, Jr. This will provides the evidence that this Sarah Martin was the first wife of Edmund Murrell, Sr.
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Found in 1850 Census, TX, Harrison Co., sh. 70, img.23 of 116.
E. Murril 52 m farmer 2800 VA
C. Murrel 36 f TN
R. Murrel 20 m TN
Wm. Murrel 16 m TN
E. Murrel 11 m TN
A. Murrel 7 m TN
M. Nowlands 7 f TN
R. Murrel 1 f TX
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Found in 1860 Census, TX, Harrison Co., Ash Springs PO, Beat 7, p. 2, img. 2. He was shown to own 28 slaves. The wife's name looks like "Cate"??. Given only as "C." on the 1850 census. Name "Catherine", from other sources. This was a second wife.
E Murril 50 Va
Cater Murril 40 TN
R Murril 11 TX
S Murril 9 TX

Edmund Murrell was apparently a prosperous plantation owner. The 1860 Slave Schedule lists 28 slaves owned by E. Murril. The 1860 Census states that Murril had real estate property valued at $11,876 and personal property of $34,028.
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Descendants of Edmund Murrell

About Sarah Martin:

A will of George Martin of Harrison Co., TX, dated 19 February 1846, lists a daughter, Sarah (who was by that time deceased) as one of his children. The will mentioned as Sarah's heirs three sons - Robert Murrell, William Murrell, and Edmund Murrell, Jr. This will provides the evidence that this Sarah Martin was the first wife of Edmund Murrell, Sr.

About A. Murrell:

Name and birth date and place from 1850 Census. This is the only reference I've found to this person, and it's unproven that he was a son of Edmund and Sarah.