Referring to the issue of unity and brotherhood, various actions of Catholic lay people prioritize ego attitudes, prioritizing personal interests rather than common interests in political life. The aim of this research is to find out how the influence partially and simultaneously the Catholic lay understanding of politics and Peace Education on Fraternitas et Amicitia. The research method used is quantitative research with a correlational type of research with the test used is the multiple linear regression test, with SSPS V. 26. The research location was carried out in the Parish of Sta. Maria Immaculata Lewolaga with a total of 98 respondents from Lewolaga Parish. The results of this research show that there is a partial influence between Catholic lay understanding of Fraternitas et Amicitia with a significant value of 0.002 < 0.1 or r count 3.185 > r table 1.661. There is an influence of Peace Education on Fraternitas et Amicitia with a significant value of 0.000 < 0.1 or 6.729 r count > r table 1.661. There is a simultaneous influence between Catholic lay understanding of politics and Peace Education on Fraternitas et Amicitia with a correlation coefficient of 73.6%. From the results obtained, the Lewolaga parishioners should continue to live in brotherhood and friendship through an understanding of politics and peace education.