I think in both positions, whether as the family dealing with the atheist and vice versa, dare I say, there simply needs to be a certain respect of personal sovereignty. We all have the absolute right to follow what we deem is necessary to follow, in our hearts. Guilt, shame, worry, fear, these things are not, in my humble opinion, excuses or valid reasons to mangle someone else's mind with one's own belief of what they ought to be doing or believing. And I say "mangle" because most of the time, anyone who puts such qualifications over someone else is really only serving to confuse someone who is in the process of finding themselves, which I think is a very important milestone in someone'slife than not many complete or even begin... and, ultimately, we should ask ourselves what is it that anyone really needs or even wants? Love. Acceptance. That said, there's this great story, that although is, as you will see, specific to one side or another as far as point of view, it really goes for anyone who is thinking of trying to impose themselves onto someone else's life experience. It goes something like this: once there was a native on his land and a missionary visits him to spread his beliefs to the people. He is obviously doing so because he believes he must and finds that it is his duty. The missionary tells the native that what he and his people are up to is Satan work and that they'll all go to hell if they continue. The native, after a short ponder, asks... if you didn't tell us this word you speak of, would we still have gone to hell? The missionary replied that he supposes not, for they wouldn't have known any better. And the native tells the missionary "So, why did you come to tell us?"
For me there is a lot that can be gleaned from this story. I will say that, personally, I believe there is a lot of value in self discovery and doing what you feel you should do as an autonamous Human being, an equal to all others. As an equal and as an individual, there is no real need to be the preacher or the preached to. All teaching one receives should be by choice and seeking and thus having a respect for those different than you and mind or any other way, should be looked upon with love. Feel no resentment towards them even if they have a resentment towards you. Their feelings ultimately should not change your own. You are autonomous. You are an individual. You are your own. In fact, to have broken away from any thought pattern is proof enough... now continue and continue with love. Smile when others cannot fathom your direction. Humor others only if you can or desire to. Hold your place lightly, see others lightly. Even if, while one is young, especially, and family requires that you be a part of something you wholly disagree with... you have many options to explore in that situation but if all you can see to do is participate, then go ahead. It cannot change you. No one can control your mind and nor can they truly control your action. Follow yourself happily into freedom, for only that, I think, can really take you to it. Happiness and acceptance will provide clarity. Be sure of yourself.