my grandparents could -------(all \ both) swim when they were young 怎么填?

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my grandparents could -------(all \ both) swim when they were young 怎么填?
my grandparents could -------(all \ both) swim when they were young 怎么填?

my grandparents could -------(all \ both) swim when they were young 怎么填?
both
祖父母是两个人,所以用both
三人以人的都,才用all

both 两者都
祝你开心。

both,grandparents 是两个人