Only cults have a vested interest in seperating families via a "religious" policy.
Jehovah's Witnesses practice of disfellowshipping is unloving and immoral. Jesus himself spoke all the time to those that were shunned by the religious leaders in bible times. (according to the story anyway) Jesus condemned institutionalized shunning in word and deed.
For those who would dare insinuate that Jehovah's Witnesses have the exclusive truth and that Jehovah is the true god, they need look no further then the battlefield littered with poor defeated souls thanks to the policy of shunning, and the damage through the decades that this has caused.
Cult!
If Jehovahs Witnesses had the truth, they wouldn't need to shun people as they do. Sadly, they are a cult, and this is a tool they use to keep people under their control.
Wishing you the very best, esp peace of mind and wisdom in how to deal with this.