Been there, had that talk. Thankfully, my parents are mature, capable of introspection and have worked on becoming better people throughout their lives. So it went quite well, although I will say it doesn’t make much of a difference with regard to the past. That’s for me to sort out now.
Phew. The small size, combined with other people surmising it might be part of a refrigerator greatly alleviates my worries you might have picked up a piece of unexploded munitions from WW2. Which is an all too common thing over here in Germany.