SOLVED. Genre : Romance. Plot: Hero thinks heroine had his brothers kid and never told his brother. His brother died and hero wants the kid to know his side of the family. [s]

[Juliet]

I read this book in 2018. Hero saw her at his funeral putting a picture of their son in his casket and threatens her that if she doesn’t oblige he’ll take away her son. They fall in love in the process of living together and then come to know how evil the dead brother was. The hero heroine have met in the past, in a party where both of them were drunk or drugged. The dead brother was evil and did bad things.

[Mai]

Searching online I found a book that matches your description. Actually, it's two books! Book one is The Terms: Part One and book two is The Terms: Part Two by Ruby Rowe.

[Juliet]

Yes, Mai! This was the book I was searching for. Thank you so much.