The JW mentality is unique...it is all about spinning things to one's advantage. I am sure some JW's would step up and help a DF'ed relative. The Elder's Manual leaves some "wiggle" room:
" . . . What is done may depend on factors such as the parent’s true needs, his attitude and the regard the head of the household has for the spiritual welfare of the household.”
When the shoe is on the other foot, the JW's would absolutely expect the DF'ed person to care and provide for their JW relative. I can speak from experience on this one. As I have mentioned in previous posts, my JW mother relies on me to take care of many of her needs, as well as visit her on a regular basis (as the Congregation has pretty much forgotten her), yet when I am not around she wastes no time bad-mouthing me and telling everyone who is near, my wife included, what a bad and evil person I am. It is all about them, and not about doing the "right thing".