Marilene:I'm sorry but I can't help you very much with the Schlee/Slee family.Here's what I know about Joseph:
Born about 1840, State of Tennessee, USA; parents born in Germany. Married Sophia Dickerson, 1868, Washington County, State of Iowa, USA. Resided 1870, Columbus City, Louisa County, State of Iowa, USA. Resided 1880, Multnomah County, State of Oregon USA. Possibly died between 1880 and 1900, State of Oregon (have found no evidence of his death).
Please contact me again if you think Joseph is a member of your Schlee family.