Access, notice and permission are three different things
Most family friction about houses is actually confusion between these three. Someone may have a key for emergencies (access) but still be expected to text before coming over (notice), and definitely not to rearrange your kitchen cupboards (permission). Nobody said any of this, so everyone assumed.
It is worth deciding, with whoever you live with, what your household actually wants. Who holds a key and for what purpose? Is it fine to come in when you are out, or only when you are home? Are there rooms that are private? What about deliveries, workmen, pets? Half an hour of this between two partners prevents years of low-grade resentment, particularly where one person's parents are far more involved in the house than the other's.
How to ask for a key back without a rupture
Lead with the logistics and keep the emotion out of it where you can. "We're having the locks done" or "we're getting all the spares back in one place so we know where they are" is true, unremarkable and gives the other person a dignified exit. If you would rather be direct, pair the request with a genuine invitation: "I'd love you to come more often — can we just make it a plan rather than a surprise?"






