According to History of Highland Co. VA, Morton conjectures that Garrett and Michael are brothers

Morton notes children as
John, md Elizabeth Beverage
Jacob who md Anna Life in 1799, he died 1852
Michael
Sarah who md Adam Halterman in 1813. THINK she is confused with Sarah Fenn Peck 1792-1881 who md Samuel Martin Shears in 1808

I believe some confusion of second generation because of the names found in Garrett’s WILL