I have lived with my sister for many years. Are people who are related to each other able to come within the definition of adult interdependent partners?

Yes, provided you are both over 18 and you complete an adult interdependent partner agreement. People who are related to each other by blood or adoption must complete an agreement in order to be treated by the law as adult interdependent partners.

Anyone who is under 18 cannot be in an adult interdependent relationship with someone who is related to them by blood or adoption.

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