The best replacement for fraternal twins is identical twins.

The best alternatives to fraternal twins are rated as following:
★★★★★  identical twins
★★★  identical
★★  paternal
★★  paternal twins
★  maternal
★  fraternal twins
  maternal twins

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Speaking about fraternal twins, one probably shouldn't forget about ttts.

Other search terms related to fraternal twins and their ratings are:
★★★★★ ttts
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