I think it's natural to seek approval from your parents. Especially if you've received it for a good bit of your life until you decided to stop being a JW. I would think that's why the ones who leave are usually "the black sheep" of the family (acting up even before leaving)- meaning they probably stopped getting approval a while back so it didn't really matter so much to lose it.
Eventually you come to terms with it- you just accept that no JW will ever support your decision to leave and they will feel inclined to read literature, ask elders, etc to figure out how they should handle you. This is what has happened in my family. But I'm lucky that my mom (btw- all of my family except me is extremely "active") continues to have a relationship with me although I've been inactive almost a decade. She does support me in what she can...my choices in education, career, etc. I like what another poster said about still treating them well even though you aren't getting that treatment back. I always send cute pics of my kids to all my family, congratulate them on graduations,etc even though I might not get a response. They can decide how they treat me and I decide how I will treat others regardless.
I have alot of people in my life who show me love and support- I think sometimes you just have to realize that it might not be from the people you expect or want. But why focus on the person who is treating you like shit or not giving you what you want/need when you could choose to focus on all the people who show their love and care on a daily basis. That's why it's so important to find people like that. The more positive people are around you, the less you'll "need" your family. Think of them as people who are sick and just incapable of loving you the way you need to be loved. There are alot of people who have parents like that (think mental illness, addiction,etc)
The family that doesn't contact me are just following rules- it's not personal. I finally got that at some point so I don't have to be proving what a wonderful person I am to them..or convince them they are insane for following these rules....
I don't really have time to try to figure out why my family continues to be in this religion or why they raised me in it. I don't get too much out of that myself and I just go around in circles and it doesn't change the past or how they treat me now. Obviously I'm not raising my kids that way - that's about all I can do.