Many thanks ladies - much of what I thought. i was asking for a friend, because I know what i do and did not want to give wrong advice.
I tell the EX and then do what I like, where I like, when I like. i keep the passports because I paid for them.
I have been asked on numerous occasions to prove the DCs are mine, since we split up. Prior to split never asked once! ( I did not change my surname when we married)
The change happened because his new DP, decided to anonymously inform immigration I was high risk for child abduction. Along with reporting me to the taxman, for benefit fraud and telling SS that she was suspicious about abuse. Effing awful 9 months getting all that sorted. The only one that still causes issues is the immigration one - we fly alot to see family all over the world.
I have been told by immigration officials that the law is - I must carry their birth certificates ( it is not, it is advice), I have been given the full right on catholic rant about unmarried mothers, the christian way of bringing up children, that in the muslim world I would not be tolerated , I am setting a bad example to my children, I am a bad mother, their father knows best etc etc etc - all by immigration officials.
Out of sheer bloody mindedness, I refuse to carry their birth certificate, because the lunacy of asking me as I bring them into the country, never as I leave, is ridiculous. Ex took them a few years ago away - did not get asked, because he has the same surname. yet they do not live with him, all his family live overseas and he was travelling with his new DP and her two kids , who have two different surnames and different from his and hers!!!
Got asked again in July - eldest DC now 9 - said to the man, - "why do you keep asking - you can see by the computer that we always go and out and come in with her, we have only been on holiday with Daddy 3 times".
Love him dearly!!
I always let EX know where we are going, the DCS speak to him most days and I have nothing to hide. I am not and have not been the Twunt in the whole debacle!