Store 5 kgs wheat
Store 10 kgs wheat
If you can't store wheat, store flour, or rice, or whatever your family eats most of.
This wheat can be put through a grinder to make bread, or tortillas daily if needs be. I do have some wheat stored (20 kilos, or something like that), but I tend to store more flour as I used to be allergic to wheat when I was a child. Some people can develop intolerances for whole wheat in breads. I am not willing to risk that should I need to rely solely on my food storage.
You can sprout wheat too, and munch on that. There is a recipe for 'Swamp Water' floating around in my food storage folder which uses ground up wheat grass. I have tasted it. I was very nearly sick. I don't think I'll be making that unless my life depended on it - and I'm seriously hoping it won't come to that! ;D