Why di after sister but not after brother?

In Challenge Course these two phrases are used:

Dwi’n nabod rhywun sy’n nabod dy frawd.
I know someone who knows your brother.

Wnaeth fy chwaer gyfarfod rhywun ddoe sy’n nabod dy chwaer di.
My sister met someone yesterday who knows your sister.

I wondered why “di” is necessary after sister in the second phrase.

Well, the “correct” way of saying your brother is dy frawd di, but often in spoken Welsh the echoed pronoun is omitted, especially if the “main word” (brother in this case) undergoes a noticable mutation. As chwaer isn’t susceptible to soft mutation, many speakers will leave the echoed di in, to make the structure clear: dy chwaer di (but you’ll also hear people say dy chwaer)

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Thanks Hendrik. Great explanation.