children of a mother aged 20 will have a grandmother aged 40, a great-grandmother aged 60, and a great-great-grandmother aged 80
children of a mother aged 40 will have a grandmother aged 80 -- for a few years.
children of a mother aged 20 will have a grandmother aged 40, a great-grandmother aged 60, and a great-great-grandmother aged 80
children of a mother aged 40 will have a grandmother aged 80 -- for a few years.
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