Gisele Bündchen and jiu-jitsu instructor Joaquim Valente have raised a lot of suspicion as to possible romantic ties, but we at least now know one of the reasons he's traveled with her to Costa Rica ... he's training her and Tom Brady's kids.
Sources close to Gisele tell us the kids, Benjamin and Vivian, are homeschooled and have a team travel with them to make sure they're receiving all the necessities for their education. We're told there's a full-time teacher who travels to teach the kids their basics .