Questions & Answers about Moja sestra vodi djecu u školu.
Because moja has to agree with sestra.
In Croatian, possessives like moj (my) change form to match the noun’s:
Since sestra is feminine singular nominative, the correct form is moja.
Compare:
- moj brat = my brother
- moja sestra = my sister
- moje dijete = my child
Sestra is in the nominative singular.
That is the case used for the subject of the sentence — the person doing the action. Here, moja sestra is the subject, because she is the one who vodi.