Relationship by blood does not, of itself, raise a presumption of undue influence.1 The fact that the parties to a transaction are brothers does not of itself raise a presumption of undue influence.2 If one brother in fact relies upon the other, and the one in whom reliance is placed takes advantage of such situation, the transaction will be set aside.3 If a sister reposes actual confidence in her brother, a transaction between them will be set aside if it is shown that the brother took advantage of such confidence.4