Millionaire half-sisters are locked in 'obsessive' court fight over £2.7m mansion as one says the other evicted her and changed the locks

Published: 10:20, 3 July 2026 | Updated: 10:21, 3 July 2026 Two millionaire equestrian half-sisters are locked in an 'obsessive' High Court battle over a £2.7 million New Forest mansion after one allegedly changed the locks and evicted the other. Lindsay Bisiker, 50, is suing her older half-sister Judith Bisiker, 63, over ownership of Moonhills, a six-bedroom house with stables, tennis court and four acres near Beaulieu, bought by their father, former Royal Marine turned oil tycoon Jim Bisiker, in 1984. Lindsay, who says Judith acted as her 'surrogate mum' while she was growing up, claims the property was always intended to be held on trust for the whole family, despite being registered solely in Judith's name.  She says Moonhills became her UK 'home base' while attending boarding school and remained her childhood home. The dispute escalated after Judith decided to sell the property.  Lindsay claims she was unlawfully excluded from the house in April 2023 when Judith arranged for the locks to be changed while she was staying there with her dogs. She is asking the High Court to declare that Moonhills is held on trust for the family, allow her to buy it at a discounted price to keep it within the family, and award compensation for her alleged eviction. Judith denies the claim, insisting that she is the sole legal and beneficial owner because their father bought the house in her name with the intention that it would belong to her. Judith Bisiker (R) and sister Heather Bisiker, who is not part of the dispute, outside High Court after hearing in row over Moonhills house Lindsay Bisiker,50, pictured outside High Court. She is suing her older half-sister Judith, 63, over ownership of Moonhills She says changing the locks was justified to prevent Lindsay from frustrating the sale and accuses her sister of becoming 'obsessed' with the property. Lindsay's lawyers argue their 95-year-old father always intended Moonhills to remain a family home and never wanted it sold on the open market.  Judith's legal team disputes that, arguing any family use was an informal arrangement rather than a legal trust and that Mr Bisiker's more recent statements are unreliable because he lacked mental capacity. James Sandham, for Lindsay, in arguments presented at a hearing earlier this year said dad Jim had backed Lindsay's version of events in written documents dating from 2016 to 2023 and in a witness statement. 'Moonhills has always operated as a family base for the children to come and go as they please,' said the barrister. 'The children have not been required to pay any form of rent and Moonhills has generally been maintained by money provided by Jim. 'The court should proceed on the basis that by evicting and/or excluding Lindsay from Moonhills and attempting to sell it, Judith has...acted in breach of trust and contrary to Jim's wishes. 'Jim did not want the property sold, his preference was for one of his children to purchase it such that it remains within the family. 'Consistent with the way it has always been used, Jim made clear that Moonhills should remain available for the use and access by the family, including for Lindsay's ongoing occupation in it as her home. 'The circumstances in which Judith evicted Lindsay on 29 April 2023 are particularly troubling...there was apparently no consideration of all the beneficiaries' views. 'Judith's denial of Lindsay's claim to have been in occupation at the time of the eviction is ludicrous...Lindsay's dogs were inside at the window and Lindsay was permitted in to collect her personal items. 'The terms of the trust are clear, having been agreed and understood by the family.' But James Saunders - barrister for Judith - argued that she 'holds both legal and beneficial title, unburdened by any trust obligation'. He told the judge, Master Matthew Marsh: 'Jim was born in 1929, lived in the UK for a period and emigrated to Canada in the 1950s. Pictured is Jim Bisiker, an ex-Royal Marine turned oil tycoon Pictured is the £2.7m house Moonhills, near Beaulieu, New Forest 'In 1981, Judith, aged 21, moved to the UK after completing her studies in Canada. Initially Judith rented a small property, but her father felt she needed a more permanent home and a property search began. 'Judith purchased Moonhills in 1984 and the property was registered in her sole name. Jim paid the purchase price. 'Judith's case is that she has always been and remains the sole owner of Moonhills. Jim purchased the property in Judith's name intending her to be the owner in law and in equity...principally in order that Moonhills should fall outside his estate for inheritance tax purposes.' Judith's lawyer says Lindsay became increasingly determined to buy the property after it was considered for sale in 2021, claiming her interest turned into an 'obsession.'  After Judith allegedly changed the locks, she then had lawyers order Lindsay to leave, and later hired a security firm to change the locks again, excluding Lindsay from the house. Lindsay claims she was unlawfully evicted from what she considers her childhood home and is seeking compensation.  She argues that Moonhills was always intended to be a family asset, held in Judith's name for tax purposes but effectively in trust for the wider family.  She told the court she lived there, kept her belongings and horse there, spent holidays there, and regarded it as a family home, with Judith acting as a surrogate mother. Judith disputes this, maintaining that Moonhills legally belongs to her and was never held in trust for the family.  While she says she has a moral obligation to honour her father's wish that relatives could use the house where practical, she argues this did not give them any ownership rights.  Her lawyer also said Lindsay was a frequent visitor rather than a resident and dismissed statements from their father supporting Lindsay's claim, arguing he lacked mental capacity by 2023. Lindsay's parents, Jim and Brenda Bisiker, have been joined as parties to the court dispute, as have her other siblings, Brian, Heather and Malcolm.  No comments have so far been submitted. Why not be the first to send us your thoughts, or debate this issue live on our message boards. By posting your comment you agree to our house rules. Do you want to automatically post your MailOnline comments to your Facebook Timeline? Your comment will be posted to MailOnline as usual. Do you want to automatically post your MailOnline comments to your Facebook Timeline? Your comment will be posted to MailOnline as usual We will automatically post your comment and a link to the news story to your Facebook timeline at the same time it is posted on MailOnline. To do this we will link your MailOnline account with your Facebook account. We’ll ask you to confirm this for your first post to Facebook. You can choose on each post whether you would like it to be posted to Facebook. 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