Be open and set a good example, (which I am sure you were going to anyway ), he will always remember his grandmother who was good and kind, and he will always remember that she did not need god to tell her to be so. That will be enough to plant questions in his mind, and if he asks questions that is all you can hope for.

As difficult as this sounds, let the child find his own way much like you and your son did. You can explain your non belief over time and let him come to his own decisions.

Talk to your daughter. Be open and honest and understanding. Make sure you are both on the same page.

Given that both you and your son "slipped" into atheism, your best bet is to hope that the boy will follow his grandmother and his uncle. As regards questions he may ask, I think "ask your mother" is probably the best (safest) answer.

Although an atheist I was brought up with a religious involvement. I will never disparage the beliefs of another person. But religion has its place as a source of fundamental socializing principles in an en environment where [a] parent[s] are not firmly established in their reasoning of the whys and where-for of social principles. I the parental input to the 's upbringing is to be critical in the 's thinking, he/she will find the answers in the religious dogmas will not be compatable with rational thought..

Your grandson is quite young, and since his parents are believers, it may be best to respect their wishes on how he is raised. There will come a time when you can truthfully tell him your true feelings.

I waited until my grandkids were older to reveal my opinions and non-belief about god. It's a tough place to be in when your kids believe and you don't, especially when there are grandchildren. I never volunteered my opinions about god to my grandkids at the request of my son's. My grandkids simply saw that I did not go to church, did not pray at family functions, didn't deck the house out for xmas, and they saw that I celebrate the Winter Solstice instead. They eventually will ask their own questions and you simply tell them your truth when you think they are old enough to understand on their own. My older grandkids (22, 18,17) know I am an unbeliever, and we have had many wonderful discussions about religion since they seem to be comfortable asking me question's about my beliefs.

Very difficult place to be as you do not want to loose your grandchild. Just let him find his own way and keep the peace.

something like this, in your own words:

honey, your nana doesn't think there are any gods. your mama thinks there is one. we're not mad at each other. we just don't agree about this. do what your mama tells you, but remember, you have a brain and you can make your own decisions about what to believe. if you decide you believe the same way as your mama, my feelings won't be hurt, and if you decide you believe the same way i do, my feelings won't be hurt, and it's okay to think about it and talk about it now, but until you're old enough to do your own thing, do what your mama tells you. if you want to talk about it with me, any old time, i am here.

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