Hello Gary and Kay,
I am also researching the surname Laehn, and live in Madison Heights with my wife. I grew up in Rochester Hills, and lived there for 30 years. Do you happen to know where your ancestor was from in Germany/Prussia? Mine were mostly from the Polish/German border with some cities now being in Poland. I would like to help you both if I can. Did you know ther is actually a city by the name Laehn? Let me know what you have so far...
Best Regards,
Brian