On 30 June 1780, she gave refuge to her nephews and nieces: the children of her brother Duke Anthony Ulrich of Brunswick and the Russian regent Anna Leopoldovna, siblings of the deposed Czar Ivan VI of Russia, when they were released from Russian captivity. Upon an agreement with Catherine the Great, she received Catherine (1741–1807), Elizabeth (1743–1782), Peter (1745–1798) and Alexei (1746–1787), who were born in captivity, and let them live the rest of their lives in comfortable house arrest in Horsens. The siblings were kept under the responsibility of Juliana, and on the financial support of Catherine.