Русско-англо-русский юридический словарь

Singapore's prime minister Lee Hsien Loong is facing a political crisis after being accused by his younger siblings of abusing his official powers to interfere with their late father's wishes regarding the family home. (International Business Times)

She is believed to still have an influential role within the regime and enjoy the trust of her older sibling. (The Telegraph)

close relation means spouses, domestic partners, parents, children, siblings and each of their respective spouses or domestic partners. (LawInsider)

You can use the phrase next of kin to describe your family members, especially those who are closely related to you, like your children, spouse, siblings, or parents. (Vocabulary.com)