My partner and I are going on holiday next year and we would like to take his dd with us. Problem is, she doesn't have a passport and never has and dp doesn't have parental responsibility over his dd and stated on the passport forms, the person with pr needs to sign the form. He is on the birth certificate but the reason he doesn't have pr is only the Mum had parental responsibility of the child regardless if the father was on the birth certificate then the law changed in 2004 but dsd was born in 2003  we haven't asked dsd's mum to sign it because we know she wont, she's spiteful. Would we be unreasonable just send off for it? Would dp get into trouble?