"Bottom line" refers more specifically to net profit after expenditure. In this context it probably refers to the money that the Miller family will have left after paying expenses.
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Liveinjapan Does that mean 'How this IPO will benefit of Miller familiy'?Hi LiJ, just an aside. I've been seeing this construction quite a lot lately. I think sometimes English learners forget to distinguish between the verb "to benefit" and the noun "the benefit of."