According to the Simpsons family tree, who´s Mona?
Can you answer this question? Sure you can!
Mona is Homer´s mother, Marge´s mother-in-law and Bart, Lisa and Maggie' s grandmother, among other things.
In case you need it, let´s review the Saxon Genitive structure today with the help of a site, English Spanish Link, which gives us some very clear instructions to express possession in English, paying special attention to the most frequent mistakes we usually make.
This structure is used as a way to refer to possession (possessive case). The apostrophe + s is added to singular nouns and just the apostrophe to plural nouns. The Saxon genitive is limited to (with some exceptions) people and animals (animate nouns).
My father´s bicycle (Refers to the bicycle that my father has.)
John's new job (Refers to the new job that John has.)
My parents' house (Refers to the house that my parents have.)
The lions' meat (Refers to the meat that the lions have.)
Irregular plural nouns take the apostrophe + s:
The Oxford Women's Club.
Children's toys.People's free time.
(Means, my cousin is the son of the brother of my father.)
We can show a chain relationship in this way:
My father's brother's son is my cousin.