Continuing the search for Charles Scriven... we assume he was living in Philadelphia when George was born in 1854 so let's chase him through the Philadelphia city directory to see when/where he is listed.
1850 and 1851 have a Scriven, Thomas, Cigar Maker - but no Charles. According to Census 1850 and 1860, Thomas Scriven is born about 1803/1804 in Philadelphia and therefore not likely a (close) relation to Charles.
1852 - No Scriven's listed.
1853 - Scriven, Charles, Bookseller, 50 Walnut
1854 and 1855 - Scriven, Charles H., Bookseller, 50 Walnut, h 284 Race
1856 - No Scriven's listed... A new bookseller (Thomas Leidy) is now at 50 Walnut.
Going from the above information I make a big leap of faith (and speculation that needs more research)... and over to Chicago
1855 - No Scriven's listed.
1856 - Scriven & Gallagher, advertising agents, 63 Dearborn
1863 - Scriven, Charles H., advetising agt. 63 Dearborn, h. 497 Wabash Av.
1866 - Scriven, Charles H., advertising agency and dealer in printing inks, 51 Dearborn bds. Tremont House.
Now what really caught my interest about Chicago.
1871 - Scriven, George P. 145 21st Street
In looking to confirm the above Chicago Scriven's are the same I found an 1876 report from the Supreme Court of Illinois (Campbell et al v. Benjamin et al) that is promising and (if the correct family) gives a death for Elizabeth of 1865 and indicates George was Elizabeth's only child: https://archive.org/stream/reportsofcasesatv69illi#page/246/mode/2up/search/scriven