I too made the same decision regarding my Jw kids. I am NOT a cult member, but free .
After a couple very embarassing (for them) personal visits, I explained that I will treat them like any true friends and drop around anytime I'm passing by. I call, answer my daughters phone when It's their house calling, and just generally ignore (despise) the cults hateful rules.
If the WTS thinks I won't see my kids and grandkids anytime I want - they better think again.
I think they actually enjoy it because they are not the ones doing anything wrong.
Theres actually avery funny story in connection with all this but I san't tell it here...