Child Registration as British

My wife will be applying for naturalization after one year ILR, our dauther was born here and can be registered as British, our eldest which is 10 was born outside UK and had one year ILR, can our eldest apply for BC together with my wife? What form is needed? MN1?

Im not sure what exactly you would need but if your child was born BEFORE your wife was granted ILR then you need MN1 form + £400 FEE.