Fantastic situation! They are in your house and they have to listen to you if you talk in YOUR HOUSE! If it's on charge of apostasy best thing to do would be to tell them that you realy love them as a person, and that you forgive them their sin of ignoring you. How great it would be to sit down and read bible verses and "think aloud" maybe some parts of Matth 23 or 1Kor15. or maybe the story of the great crowd serving God in his "divine habitation" as per the WT interlinear. Singing praises to Jah in the house would be a fantastic thing, no?
They have the idea that everyone is spiritually dead outside of the org, Well I am not! I can tell you that I was never closer to God and Jesus being outside of the org! It s a tougher way but hey, doesnt the bible say something about a narrow way and the fact that the true followers of Christ would be thrown out of the congs and most would believe this was a service to God?
Cheer up. If you need christian fellowship, look around you, there are plenty of groups out there where true christians are to be found. Not many but some for sure.
God bless you.