Among the four members of the family – K, L, M & N – there is one couple, their son and their daughter. When asked about their relationships, the following were their replies. K: “N is my husband. M is my daughter.” L: “K is my mother. M is my son.” M: “K and L are of the same gender. L is my sister.” N: “L is of the same gender as I. M is my son.” It was also known that only one of them always speaks the truth. Among them, if there are two persons who always speak lies, then who always speaks the truth.

Among the four members of the family – K, L, M & N – there is one

1.	Among the four members of the family – K, L, M & N – there is one couple, their son and their daughter. When asked about their relationships, the following were their replies. K: “N is my husband. M is my daughter.” L: “K is my mother. M is my son.” M: “K and L are of the same gender. L is my sister.” N: “L is of the same gender as I. M is my son.” It was also known that only one of them always speaks the truth. Among them, if there are two persons who always speak lies, then who always speaks the truth.
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