I checked the DAR (Daughters of the American Revolution) ancestor database and found Adam Shriver, Jacob's father, listed as a patriot who had contributed to the war effort thru taxes.
There are lineages established thru Jacob's descendants to Adam.
You can see the info for yourself by simply searching for Adam Shriver on this page:
http://services.dar.org/Public/DAR_Research/search/?Tab_ID=1