I am not sure what you are saying here. Firstly, if it was an election with 3 candidates then the principal council (district/borough) or whoever provides your electoral services for you, must have sent out ballot papers. Secondly, there is no difference between a postal vote or a box vote made in person - so this is irrelevant. A relative of the candidate let alone a relative of someone else, provided they are a resident, can propose who ever they like - again irrelevant. Thirdly, some voters quite often vote for people they know nothing about, it is one of the features, wise or not, of a democratic system. Fourthly, if you stand uncontested in an election you are "duly elected" automatically. Fifthly, do as DTC suggests or, better still, stand yourself at the next opportunity.