Found on the 1880 Barron Co.,Wis. Census Chetek August Kwallek farmer age 46 b. in Prussia both parents b. in Prussia Rosa wife age 46 b. in Prussia both parents b. in Prussia August,Jr. age 15 b. in Prussia Joseph Krinac also living with them shown as a farm laborer and listed as a brother-in-law.So that could mean that Rosa's maiden name was Krinac.
I believe that August Kwallek,Jr. is the one that married Margaret Naiser and they are the parents of Benjamin James Kwallek.