# National Security and Investment Act 2021, Paragraph 10


(1) An individual, A, is connected with another individual, B, if—
(a) A is B's spouse, civil partner or cohabitee,
(b) A is a relative of B,
(c) A is the spouse, civil partner or cohabitee of a relative of B,
(d) A is a relative of B's spouse, civil partner or cohabitee, or
(e) A is the spouse, civil partner or cohabitee of a relative of B's spouse, civil partner or cohabitee.
(2) For the purposes of sub-paragraph (1)—
(a) two persons who are living together as if they were a married couple or civil partners are cohabitees,
(b) references to a spouse, civil partner or cohabitee include a former spouse, civil partner or cohabitee, and
(c) “relative” means a brother, sister, uncle, aunt, nephew, niece, lineal ancestor or descendant (the stepchild of any person, or anyone adopted by a person, whether legally or otherwise, as their child, being regarded as a relative or taken into account to trace a relationship in the same way as that person's child).

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Source: https://www.legislation.gov.uk/ukpga/2021/25/schedule/1/paragraph/10 (the official version)
Page: https://openlegislation.uk/national-security-and-investment-act-2021/schedule-1/paragraph-10
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.