This is a general schedule. Tweak it to what suits your family and what is on sale. I also changed May and June because of the recent grain shortage. If I left it till later there might be none left.
January
Relax and pay your christmas bills. 
Truthfully there was nothing there for january.
February
72 hour kits, Medications, First Aid Kits, Garden seeds
March
Milk Powder, Powdered Eggs (yuck), Toilet paper, paper products
Oils: Margarine, Butter, Vegetable, Mayonnaise, Peanut Butter
April
Fuel, Batteries, Battery operated Radio and camping Equipment
we had a storm a while ago that nocked out the power for several hours (about 8). It was nice to have a lantern to see in our dark basement suite and a radio so we could be updated on what was happening. Apparently The melting ice on the towers was causing creosote fires.
May
The Grains: Wheat, Flour, Pasta, Oats, Barley, Popcorn
June
The Leaveners: Yeast, Baking powder, Baking soda, Cornstarch
Sweeteners: sugars and honey
July
Beans, Legumes, Rice
Personal Toiletries: Soap, Toothpaste, Shampoo, Feminine Products
August
Fruits and Vegetables
Consider canning your own
September
Fruits and Vegetables con’t
Jello, Juice powders
Vitamins
October
Meat and fish
November
Cleaning Supplies, Laundry Soap, Dish Soap
December
Bedding and Sewing Supplies, Fabric
I have to say I haven’t gone as far as picking up a years supply of bedding, but I do have sleeping bags
Other Things to consider:
Wheat Grinder, Camp Stove, Dutch Oven, Wood Burning Stove, BBQ, Oil Lamps, Lanterns
Your list doesn’t mention deodorant specifically. Your kids are still young, but you have three boys. Once the first one hits age 10, you’ll want to stock up.
Do you have water stored? And fuel for the stove/dutch oven/bbq/lantern?
I have a great spreadsheet that I use to keep track of our storage. It’s called the Ultimate Food Storage Worksheet. It’s free and once you set goals for the items you store and inventory what you have it automatically calculates how much you still need to obtain for 3, 6, and 12 months supply.