Pre-CK mod...
It's a creature named after your son, who follows you around. 
Go to Vault 111 exterior and click on the radstag in console
Use the console command :
For eyebot:
"bat shauneye" 
and again
"bat shauneye" 
--------------------------------------------------------
to get Shaun(the creature)to follow you around. 
Fast travel somewhere for the creature to appear if it isn't there already.
If it still a radstag, click on it and run again. After that it SHOULD be the creature you want.
To load the mod into the game edit this file:
C:\Users\<Your windows user name>\AppData\Local\Fallout4\plugins.txt
...and add Shaun.esp to the list of mods to load. Make sure to mark the file as read-only after you edit it!
or Use a mod manager.