This  is what I gather from what you are saying:
```JavaScript
function oldestLivingFather(people){
    var OPFather = _.pluck(people, 'father'); 
    var oldestPerson = [];
    
    _.each(people, function(person) { 
            if (person.age) { 
                if (person.age > OPAge) { 
                    oldestPerson = person
            }
    });
}
oldestLivingFather(people.name)
```