I just read the OP and this:
set goals with them. Use creativity to help them to have a full share as your preaching companions.
Yes, ensure that they know your LOVE and APPROVAL are dependent on how enthusiastic they are in the Kingdumb Ministry.
Instill Christian values in them, so that they are fully aware that they are not beloved just because they are family, but, more importantly, are companions in service to the One True God (ie, the Watchtower Corporation and its representatives, the GB).
GRRRR!
tal