Blood will tell negative idiom spoken language
Used to describe that someone shows unpleasant characteristics of their relatives.
In the end, he ended up as a failure in business like his father. Blood will tell.
I have had enough of your father. He gets drunk all the time and now you're gonna be like him. Finally, blood will tell.
Not wanting to live a poor life like his family, he went to a big city to build his career. However, in the new place, he still ended up as his family. Blood will tell.
His father is a thief and now his son is just like him. After all, blood will tell.