Should grandparents take care of the kids if mothers are deployed?

A great luxury...: If grandparents are nearby and can help out, that is a great luxury. Some even move-in to help, but that is not always available or possible. Whenever mom/dad must go away for long periods, it is always difficult, so a helping hand is of tremendous value. Grandparents often help, but it is not their duty/responsibility. So, i suggest asking/talking to them for help with a solution. Good luck.

Should or could ?: They aren't obligated. Any military member who deploys is required to have a viable care plan in place for their children should they deploy. That person should be willing and responsible.