Because お祖母さん is already 88 and she can't live alone anymore.
And her memory is not 100% anymore, so お祖母さん doesn't remember our number without looking at her note.
This note is kept by the young lady who lives with her.
But it was 02:00 when she called our home, the youg lady was sleeping and お祖母さん didn't have her notebook to check our number at all.... And yet, she called
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At first i got worried, because you mustn't call someone's house at 02:00...
But after the main moment, I was happy...
Her memory seems to be backing...
The bad point about it is that she is asking about some parents that already passed away, but she doesn't know...