Qualified concubinage

It was brought to the attention of Mr. B., that his ex-wive M.  allegedly is in a new relationship for a longer time, while she claims to live on her own and not having a long term relationship. To sue out an adaption of his alimony, he needs proof that his ex-wive is living in a so called qualified concubinage. As a consequence, Mr. B. mandates Privatdetektei Ryffel AG with investigations.


Subsequently we performed a background check. We identified the center of vital interest of Ms M. Thereafter we performed interviews with neighbours at her place of residence. We verify where Ms M. stays during the night. Our observations reveal, that Ms. M. is constantly using the car of her boyfriend to commute to her workplace. An interview of the landlord brings to light, that the rent for the appartment is a 100% payed by the unmarried partner of Ms M.

Excerpt of the investigation report

"Our investigations have revealed, that the center of vital interest of Ms M. currently is located in S. at the K-street 12 and not her officially declared address. It could be observed, that Ms M. is living together with her unmarried partner, L.F. Furthermore it could be discovered, that Ms M. is using the vehicle of L.F. as if it were her own and L.F. is paying covering the rent for their mutual appartment. It has to be assumed, that Ms. M. and L.F. are living in a consensual union." ... "Based on our research, a qualified concubinage between Ms M. and L.F., appears to be a fact."

Recent rulings

Recent rulings of the federal court regarding the definition of a qualified concubinage can be found under the following links: