Legal advice: Can my tenant claim squatter's rights?

My father has let land for the past 14 years to a neighbour. There is no written lease in place and the farmer pays my father in cash once a year... can the tenant claim squatter's rights?

Adverse possession, as it is known in legal terms (otherwise known as squatter’s rights), allows a third party to claim a right over land.

Dear Karen, 

My father has let land for the past 14 years to a neighbour of ours. There is no written lease in place and the farmer pays my father in cash once a year.