Kat, I was wondering if the name was Carstens. Would make more sense than Carotens. But I cannot see a Carstens Terlefs in any index. I also considered that the surname may be TESL(something). I wasn't finding that either, but you may have more luck. Interestingly, there is a Carstens in Staples, MN in that same census year as Emma, but his surname is not Terlefs and he is not in his 60s, as was the uncle.