I'm glad your parents decided to support their daughter for a while, at least.
It's sad that they stopped not because they felt it was wrong, but because they got bullied into it by the elders.
There's no reason for families to be broken up this way by this organization. Your sister needs your love and help now that she has a child more than ever.
The hypocrisy of some Witnesses is really a problem for me, too. I got very tired of it over the years. Being "materialistic" became a favorite thing to accuse someone of in my old congregation when you were jealous of their new stuff! The PO of my old congregation was a self made millionaire, though. So, it became okay to be well off there. You were more apt to be criticized for NOT making good money in that congregation. No consistancy at all about these things, I've noticed.
My parents were horribly criticized for helping my then DF'd brother after he had a nearly fatal motorcycle accident. He couldn't walk for a year during 22 surgeries to reconstruct his legs and arms.
But, my parents ignored the elders and helped my brother anyway. They were doing nothing wrong and finally the criticism let up. The got looked down on, but nothing was done to them.
They still think of themselves as JWs but they do not really participate much now. I think that they're more soured on it than they would admit.
Someday, I hope my family sees this organization for what it is, but it's hard for people to get away from it...I know, it's still hard for me at times. Once you step outside of it, the craziness, manipulation and just plain dishonesty of it becomes so obvious though.