parties for a specific purpose, and on terms to which the interviewee has agreed and to which he/she has expressly consented.27   n enquiry into whether someone is A stateless is limited to the States with which a person enjoys a relevant link, in particular by birth on the territory, descent, marriage, adoption or habitual residence. In some cases this may limit the scope of investigation to only one State.28 In other cases this means investigating the links with several countries. The questions below will help you establishing any potential links. HANDBOOK ON PROTECTION OF STATELESS PERSONS UNDER THE 1954 CONVENTION RELATING TO THE STATUS OF STATELESS PERSONS GENEVA, 2014 NATIONALITY ņņ Does he/she hold, or has he/she previously held one or more nationality? ņņ If in doubt, what nationality does he/she think he/she has or should have? ņņ Where was he/she born? ņņ What ethnic group does he/she belong to? ņņ What nationality/ies did his/her parents and grandparents have? Where and when were his/her parents born? ņņ What nationality/ies do his/her siblings (if any) have? ņņ What nationality/ies do his/her (former) spouse/partner and children have? ņņ Whether he/she has lost or been deprived of his/her nationality? If so, on what grounds? Ask for an explanation of the circumstances. 27 However, it should be noted that there are exceptional circumstances, most notably related to the safety and security of persons of concern to UNHCR or others, in which the individual’s consent is not required. See Para. 2.2 and 6.3.2 of the Policy on the Protection of Personal Data of Persons of Concern to UNHCR. In such cases, additional consultation with UNHCR Headquarters is advisable. 28 See UNHCR, Handbook on Protection of Stateless Persons, Para. 18. A tool for their identification and enhanced protection 19