Memories of Your Father are five optional flashbacks on Iki Island in the Director's Cut. You trigger each one at a torn Sakai banner, gain a bit of Legend, and seeing all five earns the Tempest's End sword kit.
Find a ripped Clan Sakai banner and interact with it. Jin flashes back to his boyhood on Iki with his father, Kazumasa Sakai. These scenes are optional, but they fill in a lot about Jin's past on the island.
Memory of Foreboding sits between Barrier Cove and Tatsu's Ladder. Memory of Anguish lies between Kemono Trail and Kidafure Battleground. Memory of Sorrow: Thunderhead Cliffs. Memory of Kinship: Senjo Gorge. Memory of an Unfinished Song: northwest of Sly Hunter's Forest, once the other four are done.
Senjo Gorge also has the Wisteria Haiku, so pair those two. Do the last memory after the others or it will not trigger.
A Scrawled Message
A Scrawled Message is a written record from the Records of Iki set, left by locals during the Mongol invasion. You find it at a camp south of Lake Nagata on Iki Island, and it counts toward the Avid Reader trophy.
Attached to an Old Crate
Attached to an Old Crate is a written record from the Records of Iki set, left by locals during the Mongol invasion. You find it at a shed northwest of Lone Spirit Fall on Iki Island, and it counts toward the Avid Reader trophy.
Image: Sucker Punch Productions / PlayStationBamboo Strikes
Bamboo Strikes are button-timing challenges where Jin slices a row of bamboo poles. There are 20 in all, 16 on Tsushima and 4 on Iki, and completing them raises your maximum Resolve.
Beware the Tengu-Masked Archer
Beware the Tengu-Masked Archer is a written record from the Records of Iki set, left by locals during the Mongol invasion. You find it at a house in Yahata Forest on Iki Island, and it counts toward the Avid Reader trophy.