I actually had to look this up, it depends if the possessive form is actually said with one or two Ss. For instance, it's Jones's and Bridges'. https://grammar

I actually had to look this up, it depends if the possessive form is actually said with one or two Ss. For instance, it's Jones's and Bridges'. https://grammar.collinsdictionary.com/easy-learning/what-are-the-rules-for-forming-the-possessive-apostrophe-s-in-english https://grammar.collinsdictionary.com/easy-learning/what-are... https://www.sussex.ac.uk/informatics/punctuation/apostrophe/possessives https://www.sussex.ac.uk/informatics/punctuation/apostrophe/...