The best replacement for their is there.

The best alternatives to their are rated as following:
★★★★★  there
★★★★  its
★★  their
★  his
★  they're
★  them
★  there worksheet
★  her
★  thier
★  theirs grammar
★  his/her
★  theirs
  there they're
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  they
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  there grammar
  he she
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Your alternative for their is not listed? Suggest!
Speaking about their, one probably shouldn't forget about their.

Other search terms related to their and their ratings are:
★★★★★ their
★★ singular noun
★ each
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Google Trends

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their
there
its