Child travel

So just over 2 years ago my abusive ex and father to my eldest daughter agreed to a passport for us (hubby me and her half sister) to take her overseas on a family holiday. I offered to provide itinerary etc and he was fine with it. I tread carefully as him and his family get nasty and abusive, and i always play nice within reason. Well after we got back he dropped off the face of the planet never asked to see her again and havent heard anything in 2 years (its actually scary not knowing whats happening)
Both him and his family could contact me they are on fb my number and hubbys number hasnt changed. I fb check on them every now and then. I actually think he's had a stint in Jail from posts ive seen. But honestly life is so much calmer and easier without the abusive messages or wanting to see her and not showing and me having to walk on egg shells. There are no orders in place.
Now ive gone about our lives and ive booked an overseas holiday, he of course doesnt know and I'm not going to contact him. However how im freaking out. Its the first time hes not known we are takimg her out of the country, however from his actions i doubt he cares. But could i get to the air port and things go wrong? Could he pf blocked her from travelling eben not knowing any of her passport info? Or my info? Any advise ? ( bearing in mind contacting him or family could cause alot of drama)