The main difference between a fruit and vegetable is what part of the plant it comes from.
A fruit is scientifically defined as “the mature ovary of a flowering plant that is edible.” The fruit is the ovary, the seed or seeds it encloses, and any parts associated with the ovary.
There is no precise/scientific definition for vegetable, but the basic definition is “the edible root, tuber, leaf, stem, seed or flower of a plant.” A vegetable is a plant or that part of a plant which is edible, and does not necessarily have a role in the plants reproductive cycle.
Answer: They are extremely Optimistic.
Answer:
Simple. Person A adopted person B as his son...soon to realize he adopted his grandson. How could this happen? Person A's daughter died in a car crash, leaving person B an orphan. Person A was never told that Person B's mother had a son. About 5 years later, Person A decides he wants to adopt a boy. He goes to the local orphanage were all the wild children laid. There, he found Person B, not knowing who he was and what he had been through. Person A adopted Person B as his son and ta da! The mystery's of life.
(This is so informal, but I believe it's enough to answer your question)
"Hoped this helped" :)
Oh and, this triggers a new plot for a new story, thank you!