Answer:
A doctor might remove one from the neck of a Dracula victim.
It's like food but water kills it. What is it?
What has four legs during the day; and six or eight during the night?
Come up and let us go. Go down and here we stay
The root tops the trunk on this backward thing, that grows in the winter and dies in the spring.
I am your mother's brother's only brother in law. Who am I?