diff --git a/flopy/mf6/utils/codegen/filters.py b/flopy/mf6/utils/codegen/filters.py
index 201db7395..9d19f18d6 100644
--- a/flopy/mf6/utils/codegen/filters.py
+++ b/flopy/mf6/utils/codegen/filters.py
@@ -153,9 +153,10 @@ def type(var: dict) -> str:
             children = var.get("children", None)
             if children:
                 if _type == "list":
-                    import pdb; pdb.set_trace()
-                    if len(children) == 1 and (first := list(children.values())[0])["type"] == "record":
-                        return f"{Filters.Var.type(first)}"
+                    if len(children) == 1:
+                        first = list(children.values())[0]
+                        if first["type"] in ["record", "union"]:
+                            return f"[{Filters.Var.type(first)}]"
                     children = ", ".join(
                         [v["name"] for v in children.values()]
                     )
diff --git a/flopy/mf6/utils/codegen/templates/exchange.py.jinja b/flopy/mf6/utils/codegen/templates/exchange.py.jinja
index d95a831c5..998728680 100644
--- a/flopy/mf6/utils/codegen/templates/exchange.py.jinja
+++ b/flopy/mf6/utils/codegen/templates/exchange.py.jinja
@@ -13,7 +13,7 @@ class Modflow{{ title }}(MFPackage):
 
     Parameters
     ----------
-    {{ macros.vars_docs(vars, indent=4) }}
+{{ macros.vars_docs(vars, indent=4) }}
     """
 
     {% for attr in vars|attrs %}
@@ -27,7 +27,7 @@ class Modflow{{ title }}(MFPackage):
         exgtype="{{ name.r[:3].upper() }}6-{{ name.r[3:].upper() }}6",
         exgmnamea=None,
         exgmnameb=None,
-        {{ macros.init_vars(vars, indent=8, skip=name|skip_init) }}
+{{ macros.init_vars(vars, indent=8, skip=name|skip_init) }}
         filename=None,
         pname=None,
         **kwargs,
@@ -64,7 +64,7 @@ class Modflow{{ title }}(MFPackage):
             GWE Model with the name exgmnameb must correspond to the GWF Model
             with the name gwfmodelname2. 
 
-        {{ macros.vars_docs(vars, indent=8) }}
+{{ macros.vars_docs(vars, indent=8) }}
         """
 
         super().__init__(
diff --git a/flopy/mf6/utils/codegen/templates/macros.jinja b/flopy/mf6/utils/codegen/templates/macros.jinja
index 5dd6ea7a2..6e567fc39 100644
--- a/flopy/mf6/utils/codegen/templates/macros.jinja
+++ b/flopy/mf6/utils/codegen/templates/macros.jinja
@@ -2,11 +2,11 @@
 {% for name, var in vars.items() if name not in skip %}
 {% set v = var|untag %}
 {% set n = (name if alias else v.name)|safe_name %}
-{{ ""|indent(indent, first=false) }}{{ n }}{% if v.default is defined %}={{ v.default|value }}{% endif %},
+{{ ""|indent(indent, first=true) }}{{ n }}{% if v.default is defined %}={{ v.default|value }}{% endif %},
 {% endfor %}
 {% endmacro %}
 
-{% macro vars_docs(vars, indent=0) %}
+{% macro vars_docs(vars, indent=0, recurse=true) %}
 {% for var in vars.values() recursive %}
 {% set v = var|untag %}
 {% set n = v.name|safe_name|escape_trailing_underscore %}
@@ -14,12 +14,12 @@
 {% if v.description is defined and v.description is not none %}
 {{ v.description|wordwrap|indent(indent + (loop.depth * 4), first=true) }}
 {% endif %}
-{% if v.children is defined and v.children is not none %}
-{% if v.type == "list" and v.childen|length == 1 and (v.children.values()|first).type == "record" %}
+{% if recurse and v.children is defined and v.children is not none %}
+{% if v.type == "list" and v.children|length == 1 and (v.children.values()|first).type == "record" %}
 {{ loop((v.children.values()|first).children.values())|indent(indent, first=true) }} 
 {% else %}
 {{ loop(v.children.values())|indent(indent, first=true) }}
 {% endif %}
 {% endif %}
 {% endfor %}
-{% endmacro %}
\ No newline at end of file
+{% endmacro %}
diff --git a/flopy/mf6/utils/codegen/templates/model.py.jinja b/flopy/mf6/utils/codegen/templates/model.py.jinja
index b9d1bfa48..89e072ce5 100644
--- a/flopy/mf6/utils/codegen/templates/model.py.jinja
+++ b/flopy/mf6/utils/codegen/templates/model.py.jinja
@@ -14,7 +14,7 @@ class Modflow{{ title }}(MFModel):
 
     Parameters
     ----------
-    {{ macros.vars_docs(vars, indent=4) }}
+{{ macros.vars_docs(vars, indent=4) }}
 
     Methods
     -------
@@ -34,7 +34,7 @@ class Modflow{{ title }}(MFModel):
         version="mf6",
         exe_name="mf6",
         model_rel_path=".",
-        {{ macros.init_vars(vars, indent=8, skip=name|skip_init) }}
+{{ macros.init_vars(vars, indent=8, skip=name|skip_init) }}
         **kwargs,
     ):
         """
@@ -61,7 +61,7 @@ class Modflow{{ title }}(MFModel):
             Simulation that this model is a part of.  Model is automatically
             added to simulation when it is initialized.
 
-        {{ macros.vars_docs(vars, indent=8) }}
+{{ macros.vars_docs(vars, indent=8) }}
         """
 
         super().__init__(
diff --git a/flopy/mf6/utils/codegen/templates/package.py.jinja b/flopy/mf6/utils/codegen/templates/package.py.jinja
index b0ce7c603..fc2bf0ebe 100644
--- a/flopy/mf6/utils/codegen/templates/package.py.jinja
+++ b/flopy/mf6/utils/codegen/templates/package.py.jinja
@@ -25,7 +25,7 @@ class Modflow{{ title }}(MFPackage):
         self,
         {{ name|parent }},
         loading_package=False,
-        {{ macros.init_vars(vars, indent=8, skip=name|skip_init) }}
+{{ macros.init_vars(vars, indent=8, skip=name|skip_init) }}
         filename=None,
         pname=None,
         **kwargs,
@@ -43,7 +43,7 @@ class Modflow{{ title }}(MFPackage):
             Do not set this parameter. It is intended for debugging and internal
             processing purposes only.
 
-        {{ macros.vars_docs(vars, indent=8) }}
+{{ macros.vars_docs(vars, indent=8) }}
 
         filename : str
             File name for this package.
@@ -94,7 +94,7 @@ class {{ title }}Packages(MFChildPackages):
 
     def initialize(
         self,
-        {{ macros.init_vars(vars, alias=true, indent=8, skip=name|skip_init) }}
+{{ macros.init_vars(vars, alias=true, indent=8, skip=name|skip_init) }}
         filename=None,
         pname=None,
     ):
@@ -112,7 +112,7 @@ class {{ title }}Packages(MFChildPackages):
     {% if name.r != "obs" %}
     def append_package(
         self,
-        {{ macros.init_vars(vars, alias=true, indent=8, skip=name|skip_init) }}
+{{ macros.init_vars(vars, alias=true, indent=8, skip=name|skip_init) }}
         filename=None,
         pname=None,
     ):
diff --git a/flopy/mf6/utils/codegen/templates/simulation.py.jinja b/flopy/mf6/utils/codegen/templates/simulation.py.jinja
index 446c1bc8b..d50df39aa 100644
--- a/flopy/mf6/utils/codegen/templates/simulation.py.jinja
+++ b/flopy/mf6/utils/codegen/templates/simulation.py.jinja
@@ -13,7 +13,7 @@ class MF{{ title }}(MFSimulationBase):
 
     Parameters
     ----------
-    {{ macros.vars_docs(vars, indent=4) }}
+{{ macros.vars_docs(vars, indent=4) }}
 
     Methods
     -------
@@ -35,7 +35,7 @@ class MF{{ title }}(MFSimulationBase):
         write_headers: bool = True,
         use_pandas: bool = True,
         lazy_io: bool = False,
-        {{ macros.init_vars(vars, indent=8, skip=name|skip_init) }}
+{{ macros.init_vars(vars, indent=8, skip=name|skip_init) }}
     ):
         """
         {{ name|description }}
@@ -66,7 +66,7 @@ class MF{{ title }}(MFSimulationBase):
         lazy_io
             Whether to use lazy IO
 
-        {{ macros.vars_docs(vars, indent=8) }}
+{{ macros.vars_docs(vars, indent=8) }}
         """
 
         super().__init__(