diff --git a/backend/app/models/models.py b/backend/app/models/models.py
index 4b7f1e50..246bcd08 100644
--- a/backend/app/models/models.py
+++ b/backend/app/models/models.py
@@ -1451,6 +1451,8 @@ class BizProtocolPartyCustomer(Base):
     id = Column(String(64), primary_key=True, comment="主键ID")
     collection_protocol_id = Column(String(64), nullable=False, comment="采集协议单ID")
     customer_id = Column(String(64), nullable=True, comment="客户ID")
+    father_customer_id = Column(String(64), nullable=True, comment="父亲客户ID")
+    newborn_customer_id = Column(String(64), nullable=True, comment="子女客户ID")
     mother_name = Column(String(100), nullable=True, comment="母亲姓名")
     mother_phone = Column(String(32), nullable=True, comment="母亲电话")
     mother_id_card = Column(String(32), nullable=True, comment="母亲身份证号")
diff --git a/backend/app/models/research_donation.py b/backend/app/models/research_donation.py
index 4b0a3cb8..0f988ee8 100644
--- a/backend/app/models/research_donation.py
+++ b/backend/app/models/research_donation.py
@@ -71,7 +71,9 @@ class BizResearchDonationParty(Base):
 
     id = Column(String(64), primary_key=True, comment="主键ID")
     research_donation_id = Column(String(64), nullable=False, comment="科研捐赠ID")
-    customer_id = Column(String(64), nullable=True, comment="客户ID")
+    customer_id = Column(String(64), nullable=True, comment="母亲客户ID")
+    father_customer_id = Column(String(64), nullable=True, comment="父亲客户ID")
+    newborn_customer_id = Column(String(64), nullable=True, comment="子女客户ID")
     mother_name = Column(String(100), nullable=True, comment="母亲姓名")
     mother_phone = Column(String(32), nullable=True, comment="母亲电话")
     mother_id_card = Column(String(32), nullable=True, comment="母亲身份证号")
diff --git a/docs/sql/migrations/2026-10-07-party-father-newborn-customer-id.sql b/docs/sql/migrations/2026-10-07-party-father-newborn-customer-id.sql
new file mode 100644
index 00000000..4017da06
--- /dev/null
+++ b/docs/sql/migrations/2026-10-07-party-father-newborn-customer-id.sql
@@ -0,0 +1,9 @@
+-- 采集协议当事人：父亲/子女客户 ID（母亲沿用 customer_id）
+ALTER TABLE biz_protocol_party_customer
+  ADD COLUMN father_customer_id VARCHAR(64) DEFAULT NULL COMMENT '父亲客户ID' AFTER customer_id,
+  ADD COLUMN newborn_customer_id VARCHAR(64) DEFAULT NULL COMMENT '子女客户ID' AFTER father_customer_id;
+
+-- 科研捐赠当事人：同上
+ALTER TABLE biz_research_donation_party
+  ADD COLUMN father_customer_id VARCHAR(64) DEFAULT NULL COMMENT '父亲客户ID' AFTER customer_id,
+  ADD COLUMN newborn_customer_id VARCHAR(64) DEFAULT NULL COMMENT '子女客户ID' AFTER father_customer_id;