The profile for Eva (Zender) Lucas cites the marriage record of Anton Lucas and Eva Zender, as found on FamilySearch.
"Michigan, County Marriages, 1820-1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VNKK-MD3 : 2 March 2021), Anton Lucas and Eva Zender, 15 Sep 1932; citing reference ID , various county clerks and libraries, Michigan; FHL microfilm 1,784,625.
As noted by Roger and Elisa, the record names Eva's parents - Nicholos Zender and Regine Lonely - the image is of a typed and very readable document. The spelling may of course differ from what the persons themselves used, but otherwise these documents are generally very reliable.
My question to Hans would be: what are your grounds for trusting the Ancestry tree?