Even though this was posted over a year ago, I just found your message so I hope you are still checking this site.
I worked with Marjorie Kroeger in the late 1960s in Omaha, Nebraska and we became very good friends. I visited her parents farm in Belleville, Kansas many times and met some of her other relatives.She also told me about having children that she placed for adoption.
While this may not be the same Margie that you are referring to, it certainly seems very likely that it is her. My old friend moved to southern California and married.We kept in touch for many years and only lost touch after I married and moved to Virginia and then out here to California.I was looking for her on the Internet when I found your message. I remember very little of what I was told of your father but do have some minor knowledge of him.
Please contact me if you would like to discuss any of this information.