末っ子
The youngest decorates it.
末っ子が飾ります
The youngest decorates the cake.
末っ子がケーキを飾ります
The youngest decorates the cake in the kitchen.
末っ子がキッチンでケーキを飾ります
The youngest decorates the cake in the kitchen in the afternoon.
末っ子が午後、キッチンでケーキを飾ります
The youngest decorates the cake in the kitchen with our older sister in the afternoon.
末っ子が姉と午後、キッチンでケーキを飾ります