Apostrophes with Names Ending in s, ch, or z

Are you confused about how to show the plural and the possessive of certain names? Maybe you know to write I met the Smiths, I drove Brenda Smith's Ferrari, and I visited the Smiths' house. But what if the name isSanchez or Church orWilliams?

Rule: To show the plural of a name that ends in s,ch, or z, add es.

Examples:
The Sanchezes will be over soon.
The Thomases moved away.

Rule: To show singular possession of a name ending ins, ch, or z, use the apostrophe and another s.

Examples:
Bill Williams's car
Harry Birch's house
Mrs. Sanchez's children

Rule: To show plural possession of a name ending in s,ch, or z, form the plural first; then immediately use the apostrophe.

Examples:
the Williamses' car
the Birches' house
the Sanchezes' children