Since 1999 Siblings Australia has lobbied hard at both National and State for siblings to be included in policy. The organisation has contributed to inquiries, had discussions with Ministers, advisers and public servants from different departments, sent many letters and emails, and prepared a variety of submissions. Click on the link to the left to see some examples of the latter.
Siblings Australia has run two successful conferences (2004, 2009) which attracted a number of overseas and local delegates. They both resulted in a resolution, endorsed by all delegates, which highlighted the importance of sibling support.
When funding for the organisation was discontinued in late 2007, after the government changed, a petition with many hundreds of signatures and comments called on the government to recognise siblings and support the work of Siblings Australia. Many more people wrote emails and letters to Ministers. You can read the comments that were added by some of the signatories in 2008 here. A further petition in late 2015 had many more signatures and some of those comments can be seen here
Other organisations have also highlighted siblings in various position papers and other documents. Click on the 'other advocacy' link to the left to see some examples. 
Siblings Australia has recently established the Australian Sibling Advocacy Network, for people who are interested in following or contributing to advocacy for siblings at a national level.