diff --git a/mfsetup/sourcedata.py b/mfsetup/sourcedata.py
index 76fd9e77..f30cd679 100644
--- a/mfsetup/sourcedata.py
+++ b/mfsetup/sourcedata.py
@@ -184,6 +184,7 @@ def __init__(self, period_stats, dest_model):
         self._period_stats = None
 
         # attributes
+        self.dest_model = dest_model
         self.perioddata = dest_model.perioddata.sort_values(by='per').reset_index(drop=True)
 
     @property
@@ -192,6 +193,21 @@ def period_stats(self):
             self._period_stats = self.get_period_stats()
         return self._period_stats
 
+    @property
+    def stress_period_mapping(self):
+        # if there is a parent/source model,
+        # get the mapping between the parent model and
+        # inset/destination model stress periods {inset_kper: parent_kper}
+        if self.dest_model.parent is not None:
+            # for now, just assume one-to-one correspondance
+            # between source and dest model stress periods
+            return self.dest_model.parent_stress_periods
+        # otherwise, just return a dictionary of the same
+        # key, value pairs for consistency
+        # with logic of subclass get_data() methods
+        else:
+            return dict(zip(self.perioddata['per'], self.perioddata['per']))
+
     def get_period_stats(self):
         """Populate each stress period with period_stat information
         for temporal resampling (tdis.aggregate_dataframe_to_stress_period and
@@ -576,7 +592,6 @@ def __init__(self, filenames, variable, period_stats=None,
 
         self.variable = variable
         self.resample_method = resample_method
-        self.dest_model = dest_model
 
     def get_data(self):
 
@@ -599,11 +614,9 @@ def get_data(self):
         # would follow logic of netcdf files, but trickier because steady-state periods need to be handled
         #da = transient2d_to_xarray(data, time)
 
-        # for now, just assume one-to-one correspondance
-        # between source and dest model stress periods
         results = {}
-        for inset_kper, parent_kper in self.dest_model.parent_stress_periods.items():
-            data = source_data[parent_kper].copy()
+        for dest_kper, source_kper in self.stress_period_mapping.items():
+            data = source_data[source_kper].copy()
             if regrid:
                 # sample the data onto the model grid
                 resampled = self.regrid_from_source_model(data, method=self.resample_method)
@@ -612,7 +625,7 @@ def get_data(self):
             # reshape results to model grid
             period_mean2d = resampled.reshape(self.dest_model.nrow,
                                               self.dest_model.ncol)
-            results[inset_kper] = period_mean2d
+            results[dest_kper] = period_mean2d
         self.data = results
         return results