Meet John Deaves, 61, and his daughter Jenny, 39, pictured in a screen-grab from the. John and Jenny have revealed in a television interview that they are also partners, and have a nine-month-old child, Celeste, to whom John is both father and grandfather. John left the family home shortly after Jenny was born; they re-met in 2000, some 30 years later. They formed a relationship and had a previous child in 2001, who died from complications related to congenital heart disease shortly after birth.
Incest is illegal in Australia, as it is in the UK (under the Sexual Offences Act 2003), and last month a judge ordered the couple to stop having sex. There have been attempts in some European jurisdictions to legalise sibling-unions, but as yet only Sweden has introduced legislation permitting such marriages. In a number of jurisdictions, however, though marriage is not permitted, sex between siblings (so long as they are consenting adults) has been legalised. France, for example, abolished its incest laws 200 years ago.
The issues raised by this case are quite complex. Some religious groups will point to prohibitions of incest within their sacred texts (for example, Leviticus 18, which not only rules out sex with siblings, but also prohibits sex with near-in-laws such as aunts and uncles, and imposes death sentences for the sin of incest). Merely appealing to a sacred text in the context of a secular legal system is increasingly unpersuasive to many people. In any case, those texts need to be interpreted just as carefully as texts prohibiting divorce or inter-racial marriage.
Some argue that couples like John and Jenny have a human right to form a relationship, even if other members of society disapprove of that relationship. Society in general may disapprove of all kinds of relationships which are nevertheless legitimate. Others argue that these relationships present dangers to the children born to sibling-couples. Such children are six times more likely to die at birth than other children, and are significantly at risk of congenital illness. Those children who survive birth without physical harm are also likely to carry a significant psychological burden throughout life.
In response, couples could point out that some non-sibling-relationships face comparable medical issues because one or both parents may have a genetic disorder, yet the law does not criminalise those couples. If the basis for objection is merely the impact on children who issue from a union, what about the ethical status of the sibling-couples who decide to remain childless? And what degree of closeness (sometimes called "consanguinity") is ethical or unethical? Is forming a sexual relationship with a first (or second) cousin legitimate?
So, the basic question I am asking you today is this: Should the UK law be changed to permit siblings to consensually form adult sexual relationships (possibly even marriage)? This is a sensitive and serious question, so let's keep the comments on-topic and avoid unpleasantries.