code: public VariantMetadata loadPedigree(List<Pedigree> pedigrees, String studyId) {
          VariantMetadata variantMetadata = null;
          for(Pedigree pedigree: pedigrees) {
              variantMetadata = loadPedigree(pedigree, studyId);
          }
          return variantMetadata;
      }
docs: Load a list of pedrigree objects into a given study (from its study ID).
  
  @param pedigrees     List of Pedigree objects to load
  @param studyId       Study ID related to that pedigrees
  @return              Variant metadata object