’Yar uwa ta ta fi ɗan uwa na girma.

Literally:

• ’yar = female child / daughter
• uwa = mother
• ɗan = male child / son

So:

• ’yar uwa literally means child (female) of the (same) mother. In practice it means sister / female sibling or close female relative of the same generation.
• ɗan uwa literally means child (male) of the (same) mother, and it is used for brother / male sibling or close male relative of the same generation.

In everyday speech, ’yar uwa ≈ sister, ɗan uwa ≈ brother, but they can also cover cousins and other close same-generation relatives, depending on context.

It is not a mistake; the two ta have different functions:

1. ’yar uwa ta

   • Here ta is a possessive pronoun meaning her.
   • So ’yar uwa ta = her sister.

2. The second ta (right after that) is the subject pronoun she.

   • It marks the subject of the verb fi.
   • So ta fi = .