Having European uncles who settled in Brazil in the 1800s and having Brazilian cousins does not necessarily mean that you have Brazilian roots. It depends on your own family lineage and ancestry.
If your direct ancestors (parents, grandparents, great-grandparents, etc.) are of European descent and did not have any Brazilian ancestry, then your roots would primarily be of European origin. Your distant European uncles and their descendants (your Brazilian cousins) would be part of your extended family but may not impact your immediate ancestry.
However, if there is a branch of your family tree that includes a Brazilian ancestor, then you may indeed have Brazilian roots along with your European heritage. To trace your family roots accurately, it's essential to research your genealogy and gather information about your ancestors, their countries of origin, and their migration history.
Genealogy research can be a fascinating and rewarding journey, allowing you to learn more about your family's history and cultural heritage. If you are interested in exploring your ancestry further, you can begin by talking to older family members, gathering documents and records, and using online genealogy resources or professional genealogists to help you uncover your family's past.