Re: Smith family from Ky & tn
1910 census: Denton Co. Tx, JP #3, 2 May 1920, h/h 243/247
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Lark H., 61, marr.33 yrs., TN-TN-TN, Farmer, general farm.
Martha, 56, TN-TN-TN, Laborer, home farm
*Myrtie J., 16, KY-TN-TN, same as above (note the spelling)
Hattie, 14, KY-TN-TN, same as above
Did not find your David Virgil Smith, although there was one David b.1858 and another in 1876; birth years indicate neither were sons of Larkin and Martha.
Most likely, Myrtie/Mertie and Hattie were married by the 1920 census.I'm guessing that the daughter's name was Myrtle.
Hope this helps you a little bit.