Hello, My American husband and I are planning to move to the USA in 2019 taking our son and my son from my previous marriage with us. My son will be over 18 years old then so I don't expect there will be any legal issues with him coming with us (it will be his choice if he comes, he is not being forced). My question is this though... we will need to apply for visas before he turns 18, most likely the middle of next year. Where does that leave me in regards to his father and gaining permission from him? I assume he can ( and probably will ) refuse until our son has already turned 18 which totally throws out the timeline of us moving. I would like my son to come for a gap year with the option of returning home to Australia at the end if it if he hates living in the US. Any help on family law would be appreciated. Thank you.