Is familys a word

Answer 1

No, the word familys is not a word, the correct plural form of the noun family is families.

The possessive form of the singular noun is family's (our family's dog).

Answer 2

Yes, the word families' is the possessive formof the plural noun families.

Example: Every year the families on our street have a block party. These families'efforts help everyone on the street meet their neighbors.