How does theo theodorakis know the westings?

Theo Theodorakis knows the Westings because his family runs a coffee shop in the same building where the Westing family used to live. The Theodorakis family has had a long-standing relationship with the Westings, which deepens Theo's connection to the mystery surrounding Sam Westing's will. Additionally, Theo's interest in the Westing game is partly fueled by his desire to understand the complexities of the Westing family's legacy.