Yes, Marcus had an older Brother Thomas by about 7 years...that would be the correct age for Thomas. One question...where did you find the enlistment information for both brothers? Also, did they both enlist on the same day? (Marcus' death would be about one month after the enlistment date of his brother.) You said that Marcus died in camp...from the reading I've done that most probably means he died from disease...do you concur?
Thanks again for all the information!