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Well, what about the sentence:
Иванова Ирина Петровна, ветеран труда, имеет одного внука и одного правнука.
Can you find somebody who will understand it as she has granddaughter or...

Of course, because it's very strange if there are no girls among 79 people :) But if you say "2 внука и 3 правнука", I think, most of Russians will understand it as 5 males.