I'd charge my spouse. I'd insist that she pay in cash and I'd deposit it back into our mutual account immediately.
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Seriously. No. Don't charge your spouse. Even if you have separate business accounts. Whatever your spouse does you mutually benefit from as a family unit. Even if money matters are totally separate, his or her success will absolutely benefit you as well. I understand why a could would keep money "their own" my wife and I did for many years until it just wasn't very practical. But I also knew that her success dictated my own, and mine dictates hers. Furthermore my vows to her kind of state an obligation to support her endeavors.
Extended family doesn't really share this obligation and mutuality. I think in this case it really depends on your relationship with them. I'd probably help my brother out, but not so much my sister due to that he's a teenager while my sister is a married adult with a good income. I'd probably help my parents, because they raised me, but I wouldn't be so inclined to help my grandparents, because, well, they didn't. I probably wouldn't help my uncle, because he very much has an established business of his own.
So it really just depends.