I'll have to take your word for it.
Someone in the 13th Century (possibly Wauchier de Danain) thought you needed a daughter. Maybe some young infatuated fan was living her fantasy, spinning a yarn that took in poor innocent Perceval? The price of fame!
But what about your beautiful wife, Guendoloena? Has your obsession with Nimue clouded your memory? I know you repudiated her to be rid of the responsibility during your sojourn in the woods, but you did it reluctantly and for her own welfare. And Guendoloena would have happily followed you wherever your condition took you, such was her love. You can't have lost all affection for her? - you did kill her new husband, after all.