WW2 family notes

My Mum's Grandad was an engineer in the navy. He was on a ship HMNZS Achilles in the battle of the River Platte (coast of Argentina and Uruguay) on the day my Nana (his daughter) was born!   My Dad's Grandad had shell shock and every now and then he would have a turn which he knew was coming. When he felt it coming he would tell everyone to get out of the room because otherwise he would start thinking people were Nazi's and try and kill them.