[anrakushi]

absolute load of rubbish. Japanese government is currently trying to encourage people to go forth and multiply for they, like many other developed countries, have an ageing population.

your older sister is very very wrong. she might be confusing Japan with China but even in China there is no such rule.

currently in China there are a few policies.
1 child rule, which allows parents to have just one child, in more rural areas there is the 1.5 child rule where if your first child is a girl you are allowed to try again to get a male so as to help on the farm etc.
there there is the 2 child rule (i believe it is 2) where adults who have no siblings because they were part of the 1 child policy generation are allowed to have 2 children.