Can't provide a statement that the biological father agrees to immigrate.

If you can't provide the consent or explanation of your biological father, you can consider providing other documents to prove your identity and family relationship. For example, you can provide your own birth certificate, household registration book, parents' marriage certificate, divorce certificate, adoption certificate and other documents to prove your identity and family relationship. If you can't provide these documents, you can consult the Immigration Bureau for other acceptable documents. Please note that different countries and regions may have different immigration laws and regulations, so it is best to consult the local immigration bureau or lawyer to get more accurate information and suggestions before immigration.