Preparing for emergencies, when is it too much?

Some people have like a hurricane prep kit or emergency stash. Things like flashlights, batteries, water.. enough for a few days or so. Me being the anxious planner, wants to be throughly prepared for everything and I mean everythinngg. I want to have enough supplies to completely sustain a family of 4 for 1 month completely off grid. Not completely dooms day prepping but definitely more than a typically "emergency kit". My husband thinks this is over board and boarder line crazy. Am I being too anxious or is it good to be that prepped ? Also, I'm totally open to any suggestions on what to add to my check list or any "survival" tips and tricks would be appreciated!