I forgot to take care of this "argument" found in the original post:
"When Maria asked Chuckie if Rose could come and live with them so she could be close to her brother, Chuckie said "If you could teach her how to take care of the correspondence, that would relived you from that for the more important parts of the work." Does it seem logical that Chuckie would want a 10 year old girl to handle correspondence for the Watch Tower Society?"
YES, IT IS LOGICAL if you have studied WT history sufficient to understand what it meant to "take care of correspondence" at WT HQ in the late 1880s.
"Taking care of corrspondence" meant processing literature orders and subscriptions, and other similar duties. Even then, Rose would have been delegated only what a 9-10-11 year old could reasonably handle. She may have started by "picking orders", then "wrapping" and addressing", and eventually probably doing some of the necessary bookkeeping regarding orders, etc., etc. When doing research you have to remember to define terminology as it was then used.