You earn a limited income.
Your household income may not exceed a certain threshold, Famifed will investigate this. If you receive an allowance from OCMW this is not necessary because the investigation will already be done.
You have been born in Belgium, or be a citizen of a country to which the European regulations on social security apply (Austria, Bulgaria, Cyprus, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, the United Kingdom of Great Britain and Northern Ireland, Sweden and Switzerland), or be a citizen of a country which has ratified the European social charter (Albania, Andorra, Armenia, Azerbaijan, Croatia, Georgia, Macedonia, Moldova, San Marino and Ukraine) and have a valid residence permit, or have been recognised as a refugee or stateless, or be subject to the Belgian compulsory education requirement (from 01/10/2007), or have been regularised according to the Act of 22 December 1999 (from 01/10/2007), or have resided in Belgium for at least five years (since 30/09/2007) or for a least four years consecutively (from 01/10/2007) and have a valid residence permit. The Federal Public Service Social Security may accept a shorter period in certain cases.
If you want to apply for this you will first have to apply for the guaranteed family benefit with the National Family Allowance Office for Employees. If your application is declined, you will have to request an individual exception from the Ministry of Social Affairs within a 90-day period.