The procedure is very controversial but has so far been deemed legal (in the UK) or legal on a case by case basis (AU).
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no i don't think so because it may cause jealousy and resentment from other children.
Legal spouse, children, parents, siblings, siblings' children- in that order.
Yes, it is legal for step-siblings to marry in Arkansas. The state does not have laws prohibiting marriage between step-siblings, as they are not related by blood. However, it's important to ensure that no other legal restrictions apply, such as age or prior marriages. Always consult local laws or a legal expert for specific guidance.
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They don't have to. Unless the siblings are of different genders, siblings don't need to have their own room at all.
age 14
27 yrs old
In most places, it is legal for adopted siblings to marry each other. However, it is important to check the specific laws in the state or country where the marriage would take place, as laws can vary.
There appears to be no discussion of this phenomenon in the US. However in the UK there are numerous cites on search engines to it. The one that bears the most recent date is linked below.