Hi
Saw you request for information on your two Uncles if you go to www.cwgc.org. and put the names in of James and William you will get the information you are looking for,
William died in 1915 and is buried at Gallipoli details and picture of the cemetery can be obtained from the site. James's details are also on this site he is buried in France.
If their parents where James and Sarah Kennedy and James the husband of Florence
this is the correct information.
If you are interested in obtaining their medical and medal details go to

http://www.nationalarchives.gov.uk/documentsonline
enter their names and download their details you have to pay £3.50 for each.It is usally their service medals details that you get not always medical details but you may be lucky

James service number was 444323
Williams 2289

Regards