@ madge
Actually......jw/nonJW relationships can work out.....
I am married to a worldy (going on 17 yrs now) and very few of our issues have been directly related to me being a JW. No Elder has ever advised me to leave on the basis of spiritual issues........ (though one Elder did say I should hold hubby as accountable as I do other men...)
Most JWs aren't as loyal as they profess publically anyway ....... and in her case she was (a) sleeping around with a worldly guy (b) sleeping around with a worldly guy and did I mention (c) sleeping around with worldly guy...... so she clearly lacks Org loyalty on deeper levels. Go to most halls these days and you will find one or more of these Sisters
Regardless of what he is 'told'..... if he was putting himself out there in a sexual relationship, he is accountable for himself as a man. I think he is doing the right thing by asserting his rights as a parent after the fact but the whole excuse of "I didn't know until 6 mo after and she attends regularly" is tired and lame. The only way he didn't know is if he didn't care enough to want to know more about this girl before getting into her pants, an all to common case of the south-head thinking instead of the northern one.
I just don't think this is a huge deal, it happens all the time. If anyone is to 'blame' its all those men who do convert for a Sister which in turn romanticizes the possibility. When I started dating my husband I asserted our WT Conductor's situation as reason for allowance and hope......their courtship was 'epic' including a disfellowshipping and him riding into a study/conversion and saving her reputation via marriage and full ministry activity and becoming a MS/Elder ......epic, if they ever broke up I would be heartbroken because it seems like they have 'true love'..... I avoid flipping him because I see how well they get along, their children will leave the faith eventually and that is when their time will come to leave the WTS too.
As for 'halfies'...... as a mom of two halfies..... share your beliefs, explain why you don't believe as the other parent does and offer a kind, mild and fun alternative that the child can relate too and feel safe amongst. Stay deeply involved, the more a child trust and feels close to you the more reasonableness will prevail and your voice will be the calm during troublesome times. When they are of age a full inheritance of their spiritual heritage is in order if they haven't yet discerned fully the bunkness of the WTS myth.
@ Entirely Possible
I think mediation would have been better but if he is willing to take it to court.....it is his right.
I would fully expect Sister to go all uber under the pressure too, but this too shall pass, the more he pushes the more she will feel forced to remain steadfast.....really, allowing some time and working on interpersonal skills is usually the best route because acting like enemies in a duel doesn't make for a happy co-parenting situation.