The plural is "Mesdames Garcia". As far as I know, there is no established abbreviation for Mesdames.
Mrs. Jones's
There is none, just as there is no plural for "Mrs."
Both common and proper nouns ending in ch, sh, s, x, and z add -es to the end of the word to form the plural. The plural form for Mrs. Cruz is Mrs. Cruzes.The Mrs. Cruzes went to the cinema.
The plurals for Mrs Vandertramp are Mmes Vandertramp or Mesdames Vandertramp.
The Italian plural of Signora ("Mrs.") is Signore, the same spelling as the male singular Signore ("Mr.").
The plural form for Mrs. Reed is the Mrs. Reeds; the plural possessive form is the Mrs. Reeds'.
Garcias
Buenas tardes, Senora Garcia
Vivian Garcia-Shapiro is voiced by Eileen Galindo.
Mrs. Jones's
There is none, just as there is no plural for "Mrs."
Both common and proper nouns ending in ch, sh, s, x, and z add -es to the end of the word to form the plural. The plural form for Mrs. Cruz is Mrs. Cruzes.The Mrs. Cruzes went to the cinema.
The plural for Mrs. Gonzales is the two Mrs. Gonzaleses; the plural possessive is the two Mrs. Gonzaleses'.Both common and proper nouns ending in ch, sh, s, x, and z add -es to the end of the word to form the plural.Plural noun forms that already end in -s add only an apostrophe after the existing -s to form the plural.
mesdames (abbreviation: mmes)
The plurals for Mrs Vandertramp are Mmes Vandertramp or Mesdames Vandertramp.
They are two people - two is plural, so it should be "Where are Mr and Mrs Jones?"
Messrs. From the French messieurs. Also of interest, the plural of Mrs. is Mesdames and the plural of Miss is Misses.