diff --git a/CHANGELOG.md b/CHANGELOG.md
index f2f1f01..1c591b3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,11 @@
 
 👀
 
+## 0.3.8
+
+- Fixed return types for `.sqlalchemy` module.
+- `sqlalchemy.parent_children()` now takes a `lazy` parameter. Backported from 0.5.0.
+
 ## 0.3.7
 
 - Fixed a bug in `b64decode()` padding handling which made the function inconsistent and non injective. Now, leading `'A'` is NEVER stripped.
diff --git a/src/suou/__init__.py b/src/suou/__init__.py
index 2a06368..6df10f5 100644
--- a/src/suou/__init__.py
+++ b/src/suou/__init__.py
@@ -27,7 +27,7 @@ from .itertools import makelist, kwargs_prefix, ltuple, rtuple, additem
 from .i18n import I18n, JsonI18n, TomlI18n
 from .snowflake import Snowflake, SnowflakeGen
 
-__version__ = "0.3.7"
+__version__ = "0.3.8"
 
 __all__ = (
     'Siq', 'SiqCache', 'SiqType', 'SiqGen', 'StringCase',
diff --git a/src/suou/sqlalchemy.py b/src/suou/sqlalchemy.py
index 5a7bc81..0245ed6 100644
--- a/src/suou/sqlalchemy.py
+++ b/src/suou/sqlalchemy.py
@@ -21,7 +21,7 @@ from functools import wraps
 from typing import Callable, Iterable, Never, TypeVar
 import warnings
 from sqlalchemy import BigInteger, CheckConstraint, Date, Dialect, ForeignKey, LargeBinary, Column, MetaData, SmallInteger, String, create_engine, select, text
-from sqlalchemy.orm import DeclarativeBase, Session, declarative_base as _declarative_base, relationship
+from sqlalchemy.orm import DeclarativeBase, Relationship, Session, declarative_base as _declarative_base, relationship
 
 from .snowflake import SnowflakeGen
 from .itertools import kwargs_prefix, makelist
@@ -120,7 +120,8 @@ def match_column(length: int, regex: str, /, case: StringCase = StringCase.AS_IS
             constraint_name=constraint_name or f'{x.__tablename__}_{n}_valid')), *args, **kwargs)
 
 
-def declarative_base(domain_name: str, master_secret: bytes, metadata: dict | None = None, **kwargs):
+
+def declarative_base(domain_name: str, master_secret: bytes, metadata: dict | None = None, **kwargs) -> type[DeclarativeBase]:
     """
     Drop-in replacement for sqlalchemy.orm.declarative_base()
     taking in account requirements for SIQ generation (i.e. domain name).
@@ -193,7 +194,7 @@ def age_pair(*, nullable: bool = False, **ka) -> tuple[Column, Column]:
     return (date_col, acc_col)
 
 
-def parent_children(keyword: str, /, **kwargs):
+def parent_children(keyword: str, /, *, lazy: str = 'selectin', **kwargs) -> tuple[Incomplete[Relationship], Incomplete[Relationship]]:
     """
     Self-referential one-to-many relationship pair.
     Parent comes first, children come later.
@@ -208,8 +209,8 @@ def parent_children(keyword: str, /, **kwargs):
     parent_kwargs = kwargs_prefix(kwargs, 'parent_')
     child_kwargs = kwargs_prefix(kwargs, 'child_')
 
-    parent = Incomplete(relationship, Wanted(lambda o, n: o.__name__), back_populates=f'child_{keyword}s', **parent_kwargs)
-    child = Incomplete(relationship, Wanted(lambda o, n: o.__name__), back_populates=f'parent_{keyword}', **child_kwargs)
+    parent = Incomplete(relationship, Wanted(lambda o, n: o.__name__), back_populates=f'child_{keyword}s', lazy=lazy, **parent_kwargs)
+    child = Incomplete(relationship, Wanted(lambda o, n: o.__name__), back_populates=f'parent_{keyword}', lazy=lazy, **child_kwargs)
 
     return parent, child