How do you work with largest and smallest values in combination with groups?

[johanek2]

How do you work with min/max, largest/smallest values in combination with groups?

For example, say that I have a Model that looks like one of the examples:

class Person(Model):
    first_name = StringField()
    last_name = StringField()
    birthday = DateField()
    height = Float32Field()

    engine = Memory()

How do i write a query that gets the the oldest person in each family (those with the same last name)?
Can an example of this be added to the documentation @ishirav?

Thanks!