You know the scene. A kid walks into Mom's kitchen at four o'clock wearing one sock and announces that the sneakers are at home. You have two doors, two sets of shoes, and at least one kid whose feet have grown since anyone last checked. Shoe trouble is small, but it comes up every day, and it's the kind of small thing that can turn a smooth split week into a scramble. Here is how to size the supply so it fits the houses you actually have.
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Count the pairs by door, not by kid
Before you buy anything, walk each door and write down what is there. Count the everyday pair, the school pair, the sneaker for practice, the indoor shoe, and the boots or rain pair if your season calls for them. Note which door each pair lives behind. You will likely find that one door has three pairs for one kid and none for another. That gap is the first thing to fix, and it is much cheaper to fix with a list than with a trip to the store at dinnertime.
If you keep a copy of The Kids' Week and Mom's Week on the fridge, add a line for footwear to the same sheet you use for the rest of the gear. Shoes belong on the list where the bags and sports bins already are, so the same person sees both.
Match the sizes that are coming up
Kids' feet change faster than the calendar suggests, so don't buy a backup for the child you had last season. Start with the pair in use and ask two questions. Has this one started to pinch at the heel or the toes? Does the kid still walk with the heel lifting, or do the laces ride up hard over the top? A pair that feels tight now is usually a size too small within a few weeks, so buy for the foot that is walking in today, not the one you remember.
For adults, including Mom, the same test applies. Look for a closed back that stays on the heel, a sole that grips a kitchen or bathroom floor, and enough room in the toe that she is not curling her toes to keep the shoe on. If anything about her walking or balance seems off, that is a question for her care team, not a shoe shop. Your job here is only to make sure the shoes she already wears fit her feet.
Set the spare rule and name the owner
Decide which pairs are the spares and write the rule down. A practical version is one spare pair per kid at Mom's door, sized to the current foot, kept in one labeled bin with the rest of the gear that moves between houses. Keep the bin, not a bag, because a bin stays put and the spare stays in it.
Then name who checks the bin once a month. Put that name on the same sheet as the count. When the spare pair is outgrown, the person who checks the bin is the one who moves it out and replaces it, so nobody has to remember that the sneakers at Mom's are now too small.
Walk-test before you call it done
Have the kid put the shoe on, lace it, and walk the length of a hallway and back. Watch for heel slip, toe contact with the front of the shoe when they stand straight, and whether they can stop without sliding on a tile floor. A thumb's width of room past the longest toe is a common rule of thumb, but the walk test tells you more than the measurement does. If the kid winces or shuffles, the pair is not the right pair, whatever the size tag says.
Ask before you buy
Before you pay for a replacement, ask the store whether the pair can be returned or exchanged after it has been worn indoors, and ask how long that window is. Ask whether the sizing runs the same across the brand's styles, since one line can fit small while another fits true. Ask where the pair will live, because a pair that is too good for the school run should not be the one stuck at Mom's door on a Tuesday. Those three answers will save you more time than any chart.
The shoe supply does not need to be perfect. It needs to be counted, sized to the feet walking in now, and owned by one person at each door. Once those three things are settled, the four o'clock sock problem mostly goes away.