These are the canons that show it is wrong to attempt such a marriage. To cooperate with sin is itself a sin. There is a matter of prudential judgement as to whether the sin is grave, especially for a family member. A person faced with this problem needs to seek the advice of his/her pastor or spiritual director.
I’m not sure what would constitute a formal act wrt canon 1117. Obviously a baptized Catholic who now considers herself an atheist or something else, can not formally unbaptize. So, I’m still unclear.
Asking people to be as relativistic about their Catholic faith as they are themselves. That is, as far I have experienced, the normal relationship between atheists and Catholics. (I’m married to an atheist. Converted from atheism myself.)
I can’t see that the parents would ever be happy or accepting of this situation. Doesn’t mean they don’t love you.
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