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My ex's parents will probably 'look like they care' and, indeed, actually care more about my next big birthday than my own dad. He'll probably forget. But I'm pretty sure he cares about me in general so, shrug.
It's odd that they usually do more and they didn't this time but I can't imagine that it's constructive in any way to mention it. Especially if they seemed offended by your sister asking. Maybe they thought the internet present was really cool. Hope you said thanks.
Not really the same thing. I'm not upset because they didn't spend money, more that they 'didn't seem to care'.