Book set in Nazi Germany with a housewife sexually attracted to a kitchen knife

I bought it at a Dollar General or Family Dollar (I believe it was Dollar General) sometime in the early or mid 2000s. I remember the cover was white, red, and black, and it may have had the Reichsadler on the cover.

The story was from the perspective of a young German boy during the beginning of WWII, or perhaps slightly before WWII, who joins the Hitler youth movement. I believe his mother was the one who was sexually attracted to the knife. Sometime in the end of the book she stabs herself in the leg with the kitchen knife.