diff --git a/player variables documentation - Pregmod.txt b/player variables documentation - Pregmod.txt
index 0a50e92112c526d59ab80cdd1f079bbbd0ad6a30..59e431ad146679893de9b2adb5dcadacc8be4cf9 100644
--- a/player variables documentation - Pregmod.txt	
+++ b/player variables documentation - Pregmod.txt	
@@ -333,10 +333,14 @@ accepts string
 father:
 
 your father
+Accepts ID
+Values between 0 and -20 are reserved.
 
 mother:
 
 your mother
+Accepts ID
+Values between 0 and -20 are reserved.
 
 sisters:
 
diff --git a/slave variables documentation - Pregmod.txt b/slave variables documentation - Pregmod.txt
index 120a84eb27414cd5af33dbe8f41de7b69fb25d4d..24945f24566baea7407f9ed8148eeb38a3a7a924 100644
--- a/slave variables documentation - Pregmod.txt	
+++ b/slave variables documentation - Pregmod.txt	
@@ -3136,13 +3136,16 @@ mother:
 
 Slave's mother's ID
 Accepts ID
+Values between 0 and -20 are reserved.
 -1 - player
 
 father:
 
 Slave's father's ID
 Accepts ID
+Values between 0 and -20 are reserved.
 -1 - player
+-3 - player's former master
 
 sisters: