My brother-in-law is a tennis pro, and he supports my sister, their three kids, two dogs and a cat on just his salary. My SO and I are talking about starting a family, and she wants to be a stay-at-home mom. She isn't sure if we can do that on my salary, so I'm wondering what he most likely makes. I don't want to ask him directly, since I think that's kind of rude/weird.
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