Peter (1923-1995) was a son of John Morrison and Margaret Ann Macdonald, 6 Mangersta. He served in the Royal Navy during the Second World War and a record for him can be found in the Roll of Honour 1939-1945.

Peter married Mary Ann Maciver, 8 Crowlista and they lived at 13 Mangersta. They had six children.

Peter assumed tenancy of 13 Mangersta from his cousin Neil Angus Morrison.