deren	whose
derentwillen	for her sake
derentwillen	for her sake
deren Teilnahme	whose participation
deren Unterstützung von Wert war	whose support has been of value
deren die Überschwemmung, deren Folgen furchtbar waren	whose, of which the flood, the consequences of which were frightful
deren meine Freundin und deren Hund meine Freunde und deren Kinder	her, its, their my friend and her dog my friends and their children