I'll try and keep this brief...
DD is 16, not sen her bio father for nearly 14 years, I've had no contact with him in that time either, in any way, shape or form. He instigated the break in contact.
I wasn't married to her father, never lived with him, he doesn't have joint parental responsibility.
I've been married for 12 years, have a child with DH. DD's surname legally changed to DH's.
Have lived overseas for 11 years as an expat (not in mine or DH's country).
Trying to immigrate to DH's home country and are there now. New country's immigration want proof of sole custody or bio father's permission for her to immigrate.
Getting permission unlikely as I don't know where DD's father is.
Can I apply to the courts to get sole custody legally?
TIA.