This could be considered a biography because it is someone else's life that is being written by someone else
I don't think a correction is necessary. Both parts of the sentence are already in the present tense. Plus, the use of "us" in the beginning of the sentence indicates a personal attachment.
Answer:
this family was situated in the Notch...
Big, bigger, biggest
fast, faster, fastest
These are all examples of absolute form, comparative form, and superlative form of adjectives. (in that order)
