I understand how you feel. I'm having a very similar situation with my parents, specially with my mom. I haven't been in a meeting in more than a month, and she called me yesterday.
It's very difficult to know that my mom is suffering. "You are dying spiritually", "you can't stop going to the meetings", "I want to see you in the New Order"... It breaks my heart.
She's 67 yrs old, and she has been a Witness for more than 35. Who am I to kill her hopes at her age?
It's really painful for us. But, from certain point of view, is not her fault, and it's not my fault.
Damned cult.