30 years an only child, ?a man is forced to deal with having two brothers and a family past he has never known.

How does he discover this family? Inheritance, funeral? Did they know about him? What kind of family is it and what situation does it cause for him?

The idea sounds interesting, but there should be some compelling objective.

Why must he deal with two brothers?

What family past was the protagonist not aware of?

How does our protagonist and supporting characters grow throughout the story?

What's at stake?

When a man who thought he was orphaned discovers he has two brothers a family with a troubled history, he must....

Well, what must he do?? What becomes his objective goal?? ?The logline sets up a situation for a plot.? What's the plot?

Who or what is forcing the man to deal with having two brothers sounds like an important element in the story.

For instance, does he need a transplant, and thus is forced to deal with two siblings he has never known?

Is it his mother's dying wish that he get to know the two siblings he never knew.

What specifically is forcing him to have to deal with these siblings?