How would you pluralize ie Mr Jones and Mrs Smith's signatures?

Answer:
Commonly, people will use "The Jones/Smith family" to avoid trying to pluralise names, so that may be accepted. Otherwise, "Jones' " and "Smiths"
First answer by FrenchDogBleus. Last edit by FrenchDogBleus. Contributor trust: 2 [recommend contributor recommended]. Question popularity: 1 [recommend question].