I think it depends upon the group as well as how adult is the 11 year old. If there is someone who is in charge of the group willing to help care for this 11 year old in case anything happens to ggrandma then I think it is great. On other hand.... ANY THING can happen to a 30 year old taking a small child, how many times have you heard of a child not being allowed to come back? IN this situtation? I've never heard of a negative.... death can happen to anyone re: of age.