Hello, im asking here in the hope someone will know what to do in this situation. 3 years ago my cousin had a relationship with a lady from Poland. This relationship resulted in twins however she did a moonlight flit back to poland just before the twins were due to be born. Ever since then cousin talks to her on the phone to facetime his girls. Now though his ex has decided she wants to return to the uk in the wake of brexit however she is manipulative and likes to threaten to leave if he doesnt get back together with her (she has diagnosed mh problems which she has in the past been medicated for which can make her behaviour unpredictable.) The problem is the children have polish birth certificates and passports and his name is not on anything to say he is the dad. Her family are very unwelcoming and threatened cousin if he ever showed up to see his dc then they would assault him so he's never been. Now though she has booked a coach to bring her back to the uk to london (he lives in yorkshire). He has asked me to ask how he goes about getting parental rights or at least his name on the documents so she cant just take the girls away any time she feels like it. Thank you for reading.