> reunite_parent_child(data_ts_child(), data_ts_parent(), aef_id) %>% arrange_all()
      b     c d         a e     f    
  <dbl> <int> <chr> <int> <chr> <lgl>
1   1.1     5 a         1 c     TRUE 
2   1.1     7 c         1 c     TRUE 
3   4.2     6 b         2 b     FALSE

