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Normally, with a single person owning the object, I would say: This is Tom's object.

However, if there are 2 people, should I have apostrophes on both subjects or just on the second one?

E.g. These are Tom's and Jane's objects. / These are Tom and Jane's objects.

marked as duplicate by FumbleFingers, Nathan Tuggy, Community Aug 10 '18 at 3:20

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I'll base this answer on another from a different site, who cited The Grammar Bible by Michael Strumpf.

Both are valid, but the choice depends on the type of ownership. If the ownership is joint, use the latter:

These are Tom and Jane's children.

If the ownership is singular and you're discussing multiple ownerships, use the former:

These are Tom's and Jane's jackets.

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