In the sentence, "It had been Thomas's and her's secret hiding place when they were children." Is the apostrophe after 'her' correct? It seems that it should be, but my MS Word Grammar check does not recognize it. Thank you for your great service.
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Thomas's secret and hers (each has a secret)
I you he she we they it Kate the child the boys
me you him her us them it Kate the child the boys
my your his her our their its Kate's the child's the boys'
mine yours his hers ours theirs its Kate's the child's the boys'
Note that there is no her's.
AnonymousIt had been Thomas's and her's secret hiding place when they were childrenIt had been Thomas and her secret hiding place when they were children.
Since they hid in the same place, an apostrophe after Thomas is not necessary.