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My niece is spending the week with us. Bless her heart.
I'm standing outside the room she's staying in, waiting to be allowed in. She says, "You're welcome to just come in anytime!"
No, dear girl, I cannot do that. Doesn't do any good to tell me I can "just have" some of your snacks, either.
At least I've trained most of the household to accept that I have to pay for even small things. I can pay a dollar, I can pay a favor...stop telling me, "Just take it."