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The best thing to do is to be honest. Don't make up activities to have an out, just tell them that you were glad to have helped out and to keep you in mind in case there is an emergency or are really in a bind but that you need your time back for your own family. (Make sure that it is clear that you need a heads up before hand, not like 20 minutes before an activity) It will "enlighten" them to make them more aware of overstepping help offered. Not just with you but with other families that may help them later on. One thing is to be there when a family member is deployed and they really need the extra help, the other is when they have overextended themselves and need someone else to pick up slack. Sometimes the hardest part of volunteering is not the work but being able to say no when asked again. Remember, your family, marriage, and sanity comes first.