In TF2 Lore, what are the names of the Heavy's younger sisters?

In the Team Fortress 2 lore, the names of the Heavy's younger sisters are Yana and Bronislava. Yana is the youngest and is known for her sharpshooting skills, often seen wielding a sniper rifle. On the other hand, Bronislava is the middle sibling and is depicted as a powerful, yet mysterious character, who has an affinity for explosives and is often seen carrying a grenade launcher. Both sisters have been trained in combat by their older brother and are formidable additions to the TF2 world.