1. In the evening, Sonya's father cooks dinner.

2. In the evenings, Sonya's father cooks dinner.

3. Evenings, Sonya's father cooks dinner.

4. Every evening, Sonya's father cooks dinner.

(What is the difference of the four sentences in meaning?)

I don't see any difference among the four sentences in meaning.

However, I do think sentences 1 and 4 are the best.