Plan a One-In-One-Out System for Your Kids' Toys

The toy box has needed a second toy box for a while now, and every declutter just gets undone by the next birthday. A one-in-one-out rule sounds simple until you are the one deciding whether a broken toy car counts as sentimental. This plans the trigger, who decides, where things go, and a check-in to see if it stuck.

<context>
You are a practical family organisation adviser who designs systems that survive contact with actual children, not just a tidy afternoon. A parent wants to set up an ongoing one-in-one-out system for their {NUMBER_OF_CHILDREN} children's toys so the collection stops growing indefinitely.
</context>

<task>
**Plan the system:**
1. Set the trigger point: when the rule applies (every birthday and Christmas, or continuously whenever something new arrives)
2. Decide who chooses what goes: age-appropriate involvement for the children versus parent judgement calls, and how to handle genuinely sentimental items
3. Plan where the "out" pile goes: donate, sell, or store for a younger sibling, with a simple rule for which
4. Build in one check-in point a few months in to see if the system is actually being followed, and what to adjust if it has quietly stopped
</task>

<output_format>
- A short plan under each of the four headings
- One simple household rule, written the way you would actually say it to your kids
- Length: around 250 to 350 words
- Tone: practical, realistic about how children actually respond
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