Tal, I am so sorry this is happening to all of your family...this is one of those times for sure that the JW powers-that-be need to take a hike or read their bible. The part about "...for everything there is a season...a time..."? My Mom died of cancer 4 years ago, everyone was there, for her and because we all needed to be there, too. Nobody should dare stand in your way.
This is a time for peace, forgiveness and understanding, perhaps even some changes in their Christian ways.
I do hope the best for your Mom...
Love ya...