If you want Australian migration for job and grow because of long or short duration then migration to Australia under skilled migration category could be the smartest choice. Australia skilled migration program is very made for those professionals or skilled workers who do not have Australian employment offer but posses skills needed for Australian occupations.
The marriage certificates of the children always mention the death or not of their parents. In the most recent civil status records, the date and place of death are even mentioned. Similarly, the death certificates of the children make it possible to know whether their parents were deceased or not, but without more precision.