Read up on the `uselist=False` option for relationships 
-- http://docs.sqlalchemy.org/en/rel_0_9/orm/relationships.html


It would look something like this:

class Parent(Base):

    children = relationship("Child", primaryjoin="Parent.id==Child.parent_id")

    eldest_child = relationship("Child", uselist=False, 
primaryjoin="Parent.eldest_child_id==Child.id")


You may need to use a "primaryjoin" argument.

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