The answer, believe it or not, is "yes."
The Australian law on consanguinity allows marriage
between cousins, an uncle and niece, or an aunt and nephew. Unions that are illegal in Australia include those between closely related family members such as siblings, half-siblings, or grandparents and grandchildren. This law also includes adoptees, despite the fact they don’t have blood relations within their adopted families.
However, related parents are more likely than unrelated parents to have children with health problems or genetic disorders. This is because the two parents share one or more common ancestors and so carry some of the same genetic material. If both partners carry the same inherited altered (mutated) gene, their offspring are more likely to have a genetic disorder.
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