I was told exactly the same thing by my parents from the time I was a toddler. When I was 3 I met my father's 20 yo son. I never saw him again until the funeral 14 years later. My 1/2 brother was shunned and written out of the will for never being baptized. From time to time I would ask why my brother is not in our lives. The answer was "Because he doesn't love Jehovah."
If I had ever been DFed I know for a fact I would never see or hear from my parents again unless I was reinstated. They also regularly told me about the Israelites stoning their rebellious children as though they would have had no problem doing it themselves.
My childhood was full of fear and anxiety. My adulthood was spent trying to please my narcissistic mother and my angry God. At age 60 I gave up trying.
When I left I tried to reach out to my brother but I can't find him. He would be well into his 80's now.He is either dead or dead to me. (Sigh)