Who ruled with Ivan v?

Ivan V ruled jointly with his half-brother, Peter I (Peter the Great), after the death of their sister, Sofia Alekseyevna, who acted as regent for a time. Ivan V was largely a figurehead due to his poor health and limited capabilities, while Peter I took on the responsibilities of governance and eventually became the sole ruler. Their reign marked a significant period of transition in Russia as Peter I implemented extensive reforms to modernize the country.