Would you let your kids be with these people,even if they are family?

The different spiritual beliefs is not that bad a thing. However, having those beliefs forced down your throat, whether they apply to you or not is not the kind of environment you would want your children in. If it is family (as is the case with my mother) what I found works well is giving my children a healthy appreciation for different beliefs (even if it's not what we practice in our home). This gives them the opportunity to come to their own conclusions as to what they listen to of what Granny is saying about that particular issue, and what they can just p off. It's been working well in our house for quite a while. But if this is not an option for you, for whatever reason, you might just want to limit contact to times that you can be there to explain (in front of the child) that you appreciate their "concern" but that's not the way we work in this family. You will probably say it differently, but whatever works for you. If the other person is still not understanding that this is your life, your path, your choice, and simply avoid them until they do understand these things. That sounds a bit harsh, but bringing your children into an atmosphere like that can cause confusion if they don't have firm ground to stand on when it comes to spirituality and beliefs.