Hi Zana,
it was really nice reading you and finally find someone, maybe far away from where I live ( Italy ) who lives a similar situation like my wife and I.
I am very happy ( i think my wife also ) that after almost 27 years my 3 children didn't want to join the religion of my wife ( she is also very liberal ).
I have read all the comments and agree with a lot of people that commented but maybe I am one of the few that can say that I succeeded to keep them out of the cage.
First of all it is very important that you love your wife and that you will accept that if one of your kids wants to be a Jw you have to accept it, like I would have accepted it.
We always had open discussions about the Jws and very carefully I showed my wife about the Watchtowers believings and doctrines that were wrong, of course with the magazines and the books of the Watchtower.
Blood was never a problem because she wanted me ( as a jw ) to decide ( and she knew that for me it was nonsense ).
When she told the kids the biblebook stories I told them the Grimm and Andersen stories not to compete but just to be a loving father.
At 5 my daughter wanted a birthday cake and I bought her one. At 7 or 8 she wanted a birthday party with her friends and so I organized. Can you immagine a 2 mts tall guy dancing the macarena with 10 little girls? Yes I did it.
Everytime we discussed a Wt doctrine I told them very carefully my point of view.
As you are doing, we also used tomsped Christmas with my parents ( living far away from us ) but after some years we didn't go anymore and my daughter asked for a Christmas Tree and so I bought one for her.
Be carefull for the " sisters " that will visit your wife because when they will have the occasion they will tell your kids that they will be destroyed if they don't accept the religion of the Jws.
They did with my son and he had a lot of nightmares.
I told my wife that I didn't want these kind of sisters to come anymore and she respected it.
So now and then there may be some special elder that wants to covert you, your kids and push your wife to do more in field service and in these occasions you have to be very strong and keep them out of your private life.
Another point is education, education!!! The school in Italy helped me a lot because the creation theory is considered " nonsense."
Highschool and University education is very important. Maybe I can advise you to be not to negative towards this cult.
To be honest just love your wife and kids and let them have the possibilty to grow up like all the other kids and than it is up to them