https://iowagravestones.org/gs_view.php?id=1108891

UNKNOWN, NILS - Clayton County, Iowa

NILS UNKNOWN

Norway Cemetery
Clayton County, Iowa
Uploaded 6/19/2015 by
johnsongen01 [Email]

It is possible that the surname for all is Brevart, which appears next to Halvor. The dates as I can make them out are:
Hilda 1869-1870
Halvor 1870?
Nils & Anders 1870?