Suresh's sister is the wife of Ram. Ram is Rani's brother. Ram's father is Madhur. Sheetal is Ram's grandmother. Rema is Sheetal's daughter-in-law. Rohit is Rani's brother's son. Who is Rohit to Suresh ?

Explanation:-

Suresh sister's husband → Ram.
Ram's sister → Rani.
Rani's brother's son → Rohit
Rohit is the Nephew of Suresh.