I think the point that my friend's mom was making to her was that for a woman (with significantly higher social expectations for the amount of care work and housework) you can only be good at two of the three, because you are a human being with a finite amount of time and energy.
As for how you end up with just those two, I think the answer is divorce: you don't spend the energy to maintain your relationship with your spouse. Before you had kids you could invest your time and energy in your spouse and your career, then the kids come along and your relationship with your spouse weakens, either all the way to divorce or to just a degraded state.
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I think the point that my friend's mom was making to her was that for a woman (with significantly higher social expectations for the amount of care work and housework) you can only be good at two of the three, because you are a human being with a finite amount of time and energy.
As for how you end up with just those two, I think the answer is divorce: you don't spend the energy to maintain your relationship with your spouse. Before you had kids you could invest your time and energy in your spouse and your career, then the kids come along and your relationship with your spouse weakens, either all the way to divorce or to just a degraded state.