SOLVED. YA low fantasy, set of siblings. Book contained small illustrations. Published since 2000. [s]

[Kendal]

The main characters are a brother and sister - possibly twins - whose father is a professor and mother is recently dead. They've moved to a new town where their father will take up a new teaching post. There is something strange about the university - something with clocks. The children or their father or maybe all three are inventors.

[Divya]

First thought was the Templeton Twins books by Ellis Weiner?

[Kris]

Templeton Twins series by Ellis Weiner - https://www.goodreads.com/series/9172... - Divya's suggestion

[Kendal]

That's it! Thank you so much!!!