Wills and the Adminsitration of Estates

A man created a legally valid will 12 years ago, which consists of the following stipulations:

(1) The man bequeaths his ABC plc shares to his friend's two daughters, to be divided equally between them.
(2) The remainder of the man's estate is to be given to his sister.

There are no other relevant clauses in the will. The man passed away last month, and although one of his friend's daughters passed away last year, the other daughter is still alive. The man's sister is also alive.

How will the man's estate be distributed?

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