This diagram shows that the Sawicki and Piorek families have a common ancestor whose name we don't yet know. Here, it's shown as Father Piorek and his wife Mother Snowski.

The most likely explanation for the Kapusta family being related to the Sawicki family is if Rose's mother Mary was a Piorek - a daughter of Father and Mother Piorek. There's still more work to be done here.

Father Piorek Mother Snowski Frank Piorek Sophie Jadach Vicki Piorek Edward Ament Wanda Piorek Albert Vida Paul Piorek Franciska Piorek Stanislaw Sawicki Paul Sawicki Mary Rutkowski Peter Sawicki Anne Kessler Sophie Sawicki Joseph Wisniewski Edward Sawicki Joanne Lubowiecki Mary Piorek ? Peter Biesiadecki Rose Biesiadecki Ignatuis Kapusta Emil Kapusta Irene Kapusta Stanley Serafin Frank Kapusta Alice Kapusta Joseph McDonnell Anna Kapusta