Apostrophe use with proper name ending in a vowel

Where the subjects of this sentence have a last name of "Sosta", which is correct?

"Over the past twelve years, the Sosta’s have developed a reputation as two of the more personable and knowledgeable members of the paintball industry."
or
"Over the past twelve years, the Sostas have developed a reputation as two of the more personable and knowledgeable members of the paintball industry."
or
"Over the past twelve years, the Sostas' have developed a reputation as two of the more personable and knowledgeable members of the paintball industry."