Indians and Pakistanis applying for Citizenship-by-investment (CIP) programs in Europe  or Caribbean (Dominica, St Lucia, Antigua) must consider dual citizenship options for family and children. Many countries prohibit traveling with two or more passports. India does not allow dual citizenship, whereas Pakistan allows dual citizenship but only with certain countries.
 India
The Constitution of India does not allow dual or multiple citizenships. Indians who have obtained citizenship in a foreign country are required to surrender their passports or apply for OCI. Overseas Citizens of India (OCI) and Person of Indian Origin (PIO) programs does not offer “dual citizenship” status. For example if you take U.K citizenship, you are required to renounce indian citizenship.
Pakistan
The Government of Pakistan has dual nationality arrangements with following 18 countries. Pakistani nationals acquiring citizenship in these countries can keep their Pakistani citizenship.
| 1 | United Kingdom | 10 | Egypt |
| 2 | France | 11 | Jordan |
| 3 | Italy | 12 | Syria |
| 4 | Belgium | 13 | Switzerland |
| 5 | Iceland | 14 | Netherland |
| 6 | Australia | 15 | United States of America |
| 7 | New Zealand | 16 | Sweden |
| 8 | Canada | 17 | Ireland |
| 9 | Finland | 18 | Bahrain |
Source:
http://www.dgip.gov.pk/files/immigration.aspx
http://www.mea.gov.in/overseas-citizenship-of-india-scheme.htm
