Yes, apparently, they will teleport into your home. It has happened before, trust me- I'm in peaceful mode right now... and guess who's also there. The enderman. So yes, they do spawn in peaceful mode.
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Endermen spawn in caves or at night like other mobs. They are also the natural inhabitants of The End.
monsters do not spawn from monster spawners in Peaceful mode. Peaceful mode prevents hostile mobs from spawning naturally and also from monster spawners, ensuring the game remains free from any hostile creatures.
Get single player commands then type in spawn silver fish. Make sure it's not on peaceful.
You may have your difficulty set to Peaceful. Monsters will not spawn in Peaceful mode.
Them endermen spawn randomly, there're quite rare so just bring out your sword and bow and just go out hunting at night.