Guys, I can't thank you enough for all your help. Kiltaglassan, thanks for posting the anniversary notice. That poor woman , she lost her 35 year old husband and 14 year old son within 48 hours!
Heywood, thanks for the register of soldier's effects, which initially showed that all the recipients had forenames consistent with James' siblings and dathai for proving conclusively that Annie Ellis and Mary J O'Shea were sisters of James. I will now ascertain how to get the CWGC record for James, which has next to no information, updated with the relevant family details. It is the least I can do.
Thanks again to all who contributed.
Paul