We finally talked to Christian about grandma being sick. Here is what happened:
I was talking to dh in the kitchen and told him I was going to make a doctors appointment to get medication (zoloft) and Christian jumped in and said, why do you need medicine you arent' hyper (his adhd medication) Well, I said to christian that sometimes mommy gets depressed and their is medication to help that. He immediately said to me..."Are you sad cause you think Grandma is gonna die?" Wow, me and my husband were floored. So, we talked to him about what grandma has, and that we are praying for healing, but that she might pass away, whether it be from cancer or something else. He watched our dog sadie pass away, I know that is different, but I think it might help him know what death is...he saw us bury sadie too. We asked him if he wanted to ask us any questions and he said no, and we told him if he ever needed to ask us something that he could. So, he knows that grandma could die...but I dont know if he really comprehends it...maybe he does, because of what he said to me....he must also be sad.