diff --git a/cmd/main-migration/migrations/20251027091406.sql b/cmd/main-migration/migrations/20251027091406.sql
new file mode 100644
index 00000000..25df3058
--- /dev/null
+++ b/cmd/main-migration/migrations/20251027091406.sql
@@ -0,0 +1,2 @@
+-- Modify "Patient" table
+ALTER TABLE "public"."Patient" ADD COLUMN "Parent_Number" character varying(15) NULL, ADD CONSTRAINT "fk_Patient_Parent" FOREIGN KEY ("Parent_Number") REFERENCES "public"."Patient" ("Number") ON UPDATE NO ACTION ON DELETE NO ACTION;
diff --git a/cmd/main-migration/migrations/atlas.sum b/cmd/main-migration/migrations/atlas.sum
index a045414f..88047e74 100644
--- a/cmd/main-migration/migrations/atlas.sum
+++ b/cmd/main-migration/migrations/atlas.sum
@@ -1,4 +1,4 @@
-h1:ziMZz2LperFyae6+OgAW10C4nB3cdUxwlYGRyT+L+yU=
+h1:+3BKB3OrRFxkAx+v0jB8Y1tcherlTS2Sfsp+nMCTSDE=
 20250904105930.sql h1:MEM6blCgke9DzWQSTnLzasbPIrcHssNNrJqZpSkEo6k=
 20250904141448.sql h1:J8cmYNk4ZrG9fhfbi2Z1IWz7YkfvhFqTzrLFo58BPY0=
 20250908062237.sql h1:Pu23yEW/aKkwozHoOuROvHS/GK4ngARJGdO7FB7HZuI=
@@ -60,4 +60,5 @@ h1:ziMZz2LperFyae6+OgAW10C4nB3cdUxwlYGRyT+L+yU=
 20251024074315.sql h1:EjAjelgi5qAfcRq/8vPTlGGYHvAKxNTllm8f0SzZDns=
 20251025013451.sql h1:6hnuIiwYiG+6nLhOY/+Yyn+I6ZCFNRZxrJNqBV6HLqE=
 20251025013609.sql h1:evPJaTD8WxYRMOJZHkSr7ONLx9PYxT+ankzQt9c/sJ0=
-20251027075128.sql h1:bV1FEssEnGHBfBB4huqEHtIllIOJx+/l/WEJIlvKuK0=
+20251027075128.sql h1:/iFQBM1sytjqpyQSOx61q33gnorMgxTiFVSuL6bQqsM=
+20251027091406.sql h1:4nzeZ5/kDtgMpWOH39XjnZsdfowaDN+jI7NWdP4Sqbw=
diff --git a/internal/domain/main-entities/patient/entity.go b/internal/domain/main-entities/patient/entity.go
index 27d3c8ba..83afa6ce 100644
--- a/internal/domain/main-entities/patient/entity.go
+++ b/internal/domain/main-entities/patient/entity.go
@@ -16,4 +16,6 @@ type Patient struct {
 	RegisteredBy_User_Name *string              `json:"registeredBy_user_name" gorm:"size:100"`
 	Status_Code            erc.ActiveStatusCode `json:"status_code" gorm:"not null;size:10"`
 	Number                 *string              `json:"number" gorm:"unique;size:15"`
+	Parent_Number          *string              `json:"parent_number"`
+	Parent                 *Patient             `json:"parent,omitempty" gorm:"foreignKey:Parent_Number;references:Number"`
 }
diff --git a/internal/domain/main-entities/specialist/dto.go b/internal/domain/main-entities/specialist/dto.go
index 3fa6bf5e..2cd4acee 100644
--- a/internal/domain/main-entities/specialist/dto.go
+++ b/internal/domain/main-entities/specialist/dto.go
@@ -3,6 +3,7 @@ package specialist
 import (
 	ecore "simrs-vx/internal/domain/base-entities/core"
 	espb "simrs-vx/internal/domain/main-entities/specialist-position/base"
+	essb "simrs-vx/internal/domain/main-entities/subspecialist/base"
 )
 
 type CreateDto struct {
@@ -52,6 +53,7 @@ type ResponseDto struct {
 	Name                string       `json:"name"`
 	Unit_Id             *uint16      `json:"unit_id"`
 	SpecialistPositions []espb.Basic `json:"specialistPositions,omitempty"`
+	Subspecialists      []essb.Basic `json:"subspecialists,omitempty"`
 }
 
 func (d Specialist) ToResponse() ResponseDto {
@@ -60,6 +62,7 @@ func (d Specialist) ToResponse() ResponseDto {
 		Name:                d.Name,
 		Unit_Id:             d.Unit_Id,
 		SpecialistPositions: d.SpecialistPositions,
+		Subspecialists:      d.Subspecialists,
 	}
 	resp.SmallMain = d.SmallMain
 	return resp
diff --git a/internal/domain/main-entities/specialist/entity.go b/internal/domain/main-entities/specialist/entity.go
index 5c2d5b89..9efb83b0 100644
--- a/internal/domain/main-entities/specialist/entity.go
+++ b/internal/domain/main-entities/specialist/entity.go
@@ -3,14 +3,16 @@ package specialist
 import (
 	ecore "simrs-vx/internal/domain/base-entities/core"
 	eub "simrs-vx/internal/domain/main-entities/specialist-position/base"
+	essb "simrs-vx/internal/domain/main-entities/subspecialist/base"
 	eu "simrs-vx/internal/domain/main-entities/unit"
 )
 
 type Specialist struct {
-	ecore.SmallMain                 // adjust this according to the needs
-	Code                string      `json:"code" gorm:"unique;size:10"`
-	Name                string      `json:"name" gorm:"size:50"`
-	Unit_Id             *uint16     `json:"unit_id"`
-	Unit                *eu.Unit    `json:"unit,omitempty" gorm:"foreignKey:Unit_Id"`
-	SpecialistPositions []eub.Basic `json:"specialistPositions,omitempty" gorm:"foreignKey:Specialist_Id;references:Id"`
+	ecore.SmallMain                  // adjust this according to the needs
+	Code                string       `json:"code" gorm:"unique;size:10"`
+	Name                string       `json:"name" gorm:"size:50"`
+	Unit_Id             *uint16      `json:"unit_id"`
+	Unit                *eu.Unit     `json:"unit,omitempty" gorm:"foreignKey:Unit_Id"`
+	SpecialistPositions []eub.Basic  `json:"specialistPositions,omitempty" gorm:"foreignKey:Specialist_Id;references:Id"`
+	Subspecialists      []essb.Basic `json:"subspecialists,omitempty" gorm:"foreignKey:Specialist_Id;references:Id"`
 }
diff --git a/internal/domain/main-entities/subspecialist/base/entity.go b/internal/domain/main-entities/subspecialist/base/entity.go
new file mode 100644
index 00000000..bc516360
--- /dev/null
+++ b/internal/domain/main-entities/subspecialist/base/entity.go
@@ -0,0 +1,16 @@
+package base
+
+import (
+	ecore "simrs-vx/internal/domain/base-entities/core"
+)
+
+type Basic struct {
+	ecore.SmallMain         // adjust this according to the needs
+	Code            string  `json:"code" gorm:"unique;size:10"`
+	Name            string  `json:"name" gorm:"size:50"`
+	Specialist_Id   *uint16 `json:"specialist_id"`
+}
+
+func (Basic) TableName() string {
+	return "Subspecialist"
+}
diff --git a/internal/domain/main-entities/subspecialist/entity.go b/internal/domain/main-entities/subspecialist/entity.go
index a81d6ded..f2ff5d8e 100644
--- a/internal/domain/main-entities/subspecialist/entity.go
+++ b/internal/domain/main-entities/subspecialist/entity.go
@@ -1,16 +1,13 @@
 package subspecialist
 
 import (
-	ecore "simrs-vx/internal/domain/base-entities/core"
 	es "simrs-vx/internal/domain/main-entities/specialist"
 	espb "simrs-vx/internal/domain/main-entities/subspecialist-position/base"
+	esb "simrs-vx/internal/domain/main-entities/subspecialist/base"
 )
 
 type Subspecialist struct {
-	ecore.SmallMain                       // adjust this according to the needs
-	Code                   string         `json:"code" gorm:"unique;size:10"`
-	Name                   string         `json:"name" gorm:"size:50"`
-	Specialist_Id          *uint16        `json:"specialist_id"`
+	esb.Basic
 	Specialist             *es.Specialist `json:"specialist,omitempty" gorm:"foreignKey:Specialist_Id"`
 	SubspecialistPositions []espb.Basic   `json:"subspecialistPositions,omitempty" gorm:"foreignKey:Subspecialist_Id;references:Id"`
 }