The best replacement for its is their.

The best alternatives to its are rated as following:
★★★★★  their
★★★★  it's
★★  their grammar
★  its
★  it's grammar
★  its'
  it is
  his
  cheese nips
  it's grammar girl
  it has
  it 26 2339 3bs
  it's' grammar girl
  ot's
  it
  it’s
  it s
  it #39 s
  itb
  ti's

Your alternative for its is not listed? Suggest!
Speaking about its, one probably shouldn't forget about an apostrophe.

Other search terms related to its and their ratings are:
★★★★★ an apostrophe
★★★★★ apostrophe
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Google Trends

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its
their
it's