About all that I have on James and Caroline is the marriage date, which you have. I have examined the 1850 Henry County census to try to determine which children could possibly be James. The only potential parent I found--and he may be completely off base--was Simpson Alexander, Jr. Simpson had a son, James K. P., born about 1841. I don't know about other brothers and sisters, but James K. P. had at least two half-sisters, Mary and Margaret. Sorry that I don't really know anything!