Hello! Can someone please shed light on this? Is "UNKNOWN" answer in the birthday and email fields of siblings acceptable? I'm currently filling out the forms needed for PR application. My problem is, I barely know my siblings since I grew up in a different family. I know the months and dates of some of them but not the years. I have 7 siblings and 3 of them are deceased already. I have no contact with the rest of them. All I know is their names. I'm worried that this will be a red flag to the visa officer. Do I need to submit an explanation letter? Please help. TIA.