When making a title and name plural, there are some options. Obviously you need to take into account how it is said.
Two people named Smith
...the two Messrs. Smith
...the two Mr. Smiths
...the two Mmes. Smith
...the two Mrs. Smiths
...the two Misses Smith
...the two Miss Smiths
...the two Mss. Smith
...the two Ms. Smiths
Happy punctuating!
Margie