根据短文内容回答下列问题。
The Wilsons decided to go overseas for vacation. They had a family meeting to plan the vacation.
"First," Mr Wilson said, "we should decide where we are going."
"I don't agree," Mrs Wilson said, "I think we should decide when we are going first. We don't want
to go to places when they are cold."
Mr Wilson agreed, so the family's first decision was when to go on vacation. They decided
to go in July.
"Now we can decide where to go," said Mr Wilson.
"But, Dad," Ben said, "don't you think that where we go depends on (依赖，取决于) how we go?
If we plan to fly, we can go a long way. If we plan to drive, we can't go far."
Again, Mr Wilson agreed, and they discussed this. At last they agreed to travel by plane.
And so the planning meeting went on. The next day, one of Mr Wilson's friends at work asked,
"Where are you going for vacation?"
"Well," Mr Wilson told him, "we are going in summer by plane, but I don't know where we are going!"
1. Why did the Wilsons have a family meeting?
2. What did they decide first?
3. When did they decide to go?
4. How did the Wilsons decide to travel?
5. What they didn't decide？