Here are the completed sentences using the provided family words:
Note: The words 'daughter' and 'granddaughter' were not used to fill in the blanks in the provided sentences, as the blanks were already filled with appropriate terms based on the family tree structure. However, 'daughter' is used in sentence 10, and 'granddaughter' would be applicable if referring to Mia's relationship to Tony and Marla from their perspective.
The two unused words are: None were explicitly unused; all were applied to complete the sentences logically based on the family tree.