I am in a de facto relationship and have been for three years. My de facto has two children, both under 12. The whereabouts of the father is unknown as he left Australia in 2008 and has not been heard of since. Neither Child Support nor other Government Agencies have been able to find him and we are advised he has not re-entered Australia since 2008. As a 65 year old senior citizen, am I able to adopt these children under family law?