Hi Here's some background I am an Australian citizen by birth, 1967, but lived in the UK from Dec 1974 to Oct 2013 . While in the UK, I married an Englishman and had two children.... We married in 1990, he had an affair and left 2006.... Children were aged 2.5yrs and 12 weeks old when he left.... He had regular contact with them since the divorce absolute in 2007. I met A in 2007 (children's now stepdad) and we cohabited since 2009 and married in the UK in March 2013.. He is an Englishman...... I applied to the UK court and was granted leave of jurisdiction from the court of England and Wales to permanently remove the children from the UK and reside in Australia.. I am an Ausralian citizen by birth, and the children are Australian citizens by decent and the stepfather is a permanent resident in Australia ... I do not have any Mirror orders in any Aussie courts... I have a UK contact order that states alternate contact until the youngest is 16, one year UK, one year Australia... At present that is working and contact is not an issue nor are communications with their biological father .... My question is one of parental responsibility..... No one can force the future.... What if .... I died? Could my ex husband their biological, father jump on a plane knock on my husband's door (their step dad) and say, "right Mum's dead, they have to live with me now in England" with no thought to the children's lives here in Aus and the fact that their stepdad intends to and poses as their dad in the truest sense of the word for over 8 years? Can their step dad have some parental responsibility alongside me under Family Law?