Tapley "Tap" Holland is described as a 26 year old son of a War of 1812 vet. His father was William Holland, who was an original colonist with Stephen Austin.
For more information on the Holland family, see my article on The Holland Family, where I quote much of the research of Diana Holland Calderon.
My son descends from the Hollands through his mother's family (my ex-wife). The Wards trace back to the Hollands, and specifically to Susannah Holland, sister of Tap Holland.
Another source of information regarding the Hollands and Tap Holland in particular is Dr. V. M. Holland and Holland History Blog.
The Texas State Historical Association has more information about Tapley Holland as well.