Nancy, I could not find an exact match for your Alvis in my Marley family history book but did find one family that had three different descendants named Alvis.
First a little background that you may already know about but is important in trying to locate your Alvis.Four of the six Marley families in NC during the last half of the 1700s had descendants that moved to IN.In fact, to the best of my knowledge, all of the IN Marley families originated in NC in the Randolph/Chatham County areas.
In the index I located three Marley individuals with the name Alvis: 1) Alvis (born abt 1830 NC).This Alvis was the s/o John M.,s/o John, s/o William. 2) Alvis (born abt 1852, Edgar Co., IL)(died 1880 Edgar Co., IL) s/o William D., s/o John M., S/o John, s/o William. 3) Alvis (born abt 1868 NC)(killed 1891 Pueblo, CO.) s/o Haywood, s/o John M., s/o John, s/o William.
Edgar Co., IL, is located on the IL/IN state line directly west of Marion County, IN (three counties between Edgar and Marion Co.). Most of the Marley individuals started offin Lawrence Co. and then moved to Orange, Monroe, Morgan, Park, Hendricks in IN and Edgar and Vermillion Co. in IL.The one of the original NC families with Alvis descendants is William and Catherine Marley.William was born abt 1745-50,his son John was born abt 1772 (NC) and his son John M.was born about 1794(NC).
All four of the subject families (late 1700s in NC) appear to be related and used the same names in many cases.
Your Sarah Sherman was not listed in my index.
Logicwould indicate that your Alvis descended from one of the four NC families.These four families (all covered in my book) are William (referred to above), Henry, Benjamin, and John.Henry and John moved to Lawrence Co by 1820.Both William and Benjamin had descendants that moved to IN.