Legends claim you can bury a botchling under the family's threshold, perform a ritual and turn it into a lubberkin. That's a sort of, uhh... hob, a guardian spirit that could lead me to your family.
|— Geralt to Bloody Baron|
Lubberkins are friendly spirits that comes from a transformed botchling. Through an elven naming ritual, a botchling is transformed into a lubberkin.
In the quest, Family Matters, Geralt can choose to lift the curse on the botchling that was created from the miscarriage of Philip Strenger's and Anna Strenger's child. If the ritual is completed, the lubberkin will help Geralt with his quest.