When Anuj saw Manish, he recalled, "He is the son of the father of my daughter's mother." Who is Manish to Anuj?

Explanation:-

Anuj's daughter's mother---Anuj's wife; Anuj's wife father---Anu's father-in-law; Father-in; Father-in-law's son---Anuj brother-in-law.
So, Manish is Anuj's brother-in-law.