The best replacement for related is relating.

The best alternatives to related are rated as following:
★★★★★  relating
★★★  relevant
★★  interrelated
★★  relative
★★  associated
★  relayed
★  correlated
★  affiliated
  inversely related
  work related
  regarding
  skill related
  work-related
  noncombatant related

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Speaking about related, one probably shouldn't forget about hyphen.

Other search terms related to related and their ratings are:
★★★★★ hyphen
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related
relating
relevant