1091 Make get_related work multiple levels deep

[dantownsend]

Resolves #1091

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.92%. Comparing base (5173a39) to head (e62af83).
Report is 2 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1092      +/-   ##
==========================================
- Coverage   92.62%   91.92%   -0.70%     
==========================================
  Files         116      116              
  Lines        8591     8605      +14     
==========================================
- Hits         7957     7910      -47     
- Misses        634      695      +61     

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