Kasim has 4 older brothers (Osman, Mehmed, Murad and Bayezid), as well as 3 older sisters (Ayşe, Fatma and Gevherhan). He has two younger siblings, the twins Ibrahim and Atike. Kasim is a quiet and friendly child, as well as very attached to his mother, Sultana Kösem. When his father, Sultan Ahmed I, dies in 1617, he's around 3 years old. Kasim is born around 1615. His paternal uncle Mustafa is sultan in 1617-1618. His brother Osman is sultan in 1618-1622. Trauma due to almost being executed