Will the biological father be able to sign the birth certificate if the husband signs a denial?

In most jurisdictions, if a husband signs a denial of paternity, the biological father may have the opportunity to sign the birth certificate, but this can depend on local laws and regulations. The biological father may need to establish legal paternity through a court order or other legal means. It's essential to consult with a legal expert or family law attorney to understand the specific implications and procedures in your area.