You haven't explained whose birth certificate. If it's her biological child then she must sign the birth certificate. The biological parents of the child sign the birth certificate.
Since the mother herself was born in Canada, the child is eligible for Canadian citizenship. You should contact the nearest Canadian embassy or consulate general to apply for a certificate of Canadian citizenship. In the meantime, the child still can enter to Canada using his/her American passport or birth certificate (birth certificate can be used instead of a passport only if he or she is under 15).
To get a Florida birth certificate (or a birth certificate in any other state, for that matter), the child had to have been born in Florida.
No he have to sign it in order to be on there.
Not without an extended, and expensive, probate challenge.
Contact the nearest US consulate, go there and register your child's birth. The certificate they will give you will act as citizenship certificate. Then apply for your child's passport so that s/he can travel to the US with you too.
Depends. Even if he is not on the birth certificate he can still have a court ordered visitation and pay child support. In that case she needs both his and the courts permission.
The man on the birth certificate.
A child born outside the US will not be issued a US birth certificate. The birth certificate will be issued by the country in which the child was born.
The easiest way (small fee for the document) is to apply to Vital Statistics to get the birth certificate of your husband's child. The other woman does not have to give the birth certificate if she chooses not to.
A parent is the only one who can obtain a birth certificate. Your husband will have to do this.
no see links below