(I won't address you by your screen name... hope you don't mind, hehe).
Were you actually told that? By whom? Your kids, your ex-wife, both?
And how was your relationship with your kids and ex-wife before they joined the church? Reason I ask is b/c it could be characterized as PAS (parental alienation syndrome) or some other related issue - in other words, it's your problem - and you could be told it has absolutely nothing to do with the church.