"tuakana" means: In Maori contexts, the elder brother of a male or the elder sister of a female; also, a same-sex cousin of a more senior branch of the famil.... The term has a sexual reference, so parents may want to know the context in which a child uses or hears it. In most cases it is part of normal teenage curiosity rather than a concrete worry. A short, non-judgemental conversation about consent, respect and online safety is usually the best response. Look at the wider pattern of behaviour, not the one word.