Upvote:1
In normal cases the parental authorisation must have a wet signature, but if obtaining this is unreasonable they may be able to work with a faxed authorisation and proof that the parent is abroad.
To demonstrate that it is unreasonable, you can show exhibits proving his absence. But keep in mind that they will be giving a concession and they have the right to insist your father post an authorisation with a wet signature.