The correctly spelled sentence is "Rubens' sister Bella swims for the Jets too."
We know that the apostrophe is the symbol that indicates ownership and must be used after a word followed by the letter "s".
However, there are exceptions to this rule, as many words ending in "s" can be used to show ownership of something or someone.
In this case, modifying the correct spelling of the word is not allowed, separating it from the "s" that is part of its structure with an apostrophe.
It is also not allowed to add another "s" after the apostrophe, as it would harm the correct pronunciation and textual coherence.
Therefore, the ideal is to add the apostrophe and not add another "s" as was done in "Rubens' sister Bella swims for the Jets too."
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