The best replacement for custodian is janitor.

The best alternatives to custodian are rated as following:
★★★★★  janitor
★★★★  trustee
★★★★  guardian
★★  broker
★  legal guardian
★  depository
★  fiduciary
★  administrator
★  custodial
★  prime broker
★  clearing firm
★  transfer agent
  broker dealer
  conservator
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  cdp
  custodian
  asset manager
  steward
  csd
  record keeper
  trustee custodian
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Speaking about custodian, one probably shouldn't forget about joint custody.

Other search terms related to custodian and their ratings are:
★★★★★ joint custody
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custodian
janitor
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