Question: In Australian parliamentary practice, the Father of which Commonwealth Parliament or the Federal Parliament, is the legislative branch of the government of Australia, and is the more senior of the Father of the Senate and the House of Representatives?

Context paragraphs:
Father of the Australian Parliament: In Australian parliamentary practice, the Father of the Australian Parliament is the more senior of the Father of the Senate and the Father of the House of Representatives.  It is an informal, honorific title which carries no parliamentary responsibilities.  Where two or more parliamentarians have had equal lengths of continuous service, more than any other currently serving parliamentarian, they are known as the joint Fathers of the Parliament.  The current Father of the Parliament is Senator Ian Macdonald who has held the title since 10 May 2016.

House of Representatives (Thailand): The House of Representatives (Thai: สภาผู้แทนราษฎร ; rtgs: Sapha Phu Thaen Ratsadon ) was the lower house of the National Assembly of Thailand, the legislative branch of the Thai government.  The system of government of Thailand was that of a constitutional monarchy and a parliamentary democracy.  The system of the Thai legislative branch was modeled after the Westminster system.  The House of Representatives had 500 members, all of which are democratically elected: 375 members were directly elected through single constituency elections, while the other 125 are elected through party-list proportional representation.  The roles and powers of the House of Representatives were enshrined in the Constitution of 2007.

Australian Parliamentary Handbook: The Australian Parliamentary Handbook (officially the "Parliamentary Handbook of the Commonwealth of Australia"), is the official record of the Parliament of Australia.  The handbook is published once during each three-year Parliament by the Parliamentary Library of Australia, within the Department of Parliamentary Services, under the authority of the Parliament.

Senate (Belgium): The Senate (Dutch:    , French: "le Sénat" , German: "der Senat" ) is one of the two chambers of the bicameral Federal Parliament of Belgium, the other being the Chamber of Representatives.  It is considered to be the "upper house" of the Federal Parliament.  Created in 1831 as a chamber fully equal to the Chamber of Representatives, it has undergone several reforms in the past, most notably in 1993 and the reform of 2014 following the sixth Belgian state reform.  The 2014 elections were the first ones without a direct election of senators.  Instead, the new Senate is completely composed of members of community and regional parliaments and co-opted members.  It is a chamber of the communities and regions and serves as a platform for discussion and reflection about matters between the different language communities.  The Senate now only plays a very minor role in the federal legislative process.  Since the reform, it only holds about ten plenary sessions a year.

Parliament of Australia: The Parliament of the Commonwealth of Australia, variously referred to as the Australian Parliament, the Commonwealth Parliament or the Federal Parliament, is the legislative branch of the government of Australia.  It consists of three elements: the Queen of Australia, the Senate and the House of Representatives.  The Queen is represented by the Governor-General.  The combination of two elected Houses, in which the members of the Senate represent the six States and the two self-governing Territories while the members of the House represent electoral divisions according to population, is modelled on the United States Congress.  Through both Houses, however, there is a fused executive, drawn from the Westminster System.

Father of the Australian Senate: In Australian parliamentary practice, the Father of the Senate is the senator in the Australian Senate who has served longer, continuously, than any other currently serving senator.  The title is seldom used today.  It is an informal, honorific title which carries no parliamentary responsibilities.  Where two or more senators have had equal lengths of continuous service, more than any other currently serving senators, they are known as the joint Fathers of the Senate.  The current Father of the Senate is Ian Macdonald who acquired the status on 6 February 2015 after the resignation from Parliament of the then Father of the Senate, John Faulkner.

Father of the Australian House of Representatives: In Australian parliamentary practice, the Father of the House of Representatives is the member of the Australian House of Representatives who has served longer, continuously, than any other currently serving member.  It is an informal, honorific title which carries no parliamentary responsibilities.  Where two or more members have had equal lengths of continuous service, more than any other currently serving members, they are known as the joint Fathers of the House of Representatives.

Hugh Mahon: Hugh Mahon (6 January 1857 – 28 August 1931) was an Irish-born Australian politician and a member of the first Commonwealth Parliament for the Australian Labor Party.  He was the only Member of Parliament ever expelled from the Federal Parliament.

Parliamentary counsel: Parliamentary counsel are lawyers who prepare legislation that it is proposed to pass into law.  The terms Parliamentary drafter, Parliamentary draftsman, legislative drafting officer and legislative counsel are also widely used.  These terms are used in relation to the United Kingdom parliament in Westminster, and other parliaments and assemblies based on the Westminster system.  The official title, and organisation, of the parliamentary counsel varies between legislatures.  For example, those who draft government legislation for the UK parliament form the Parliamentary Counsel Office (established in 1869 under the title of the Office of Parliamentary Counsel) while the Scottish Government's Parliamentary Counsel Office drafts legislation for the Scottish Parliament, the (Northern Irish) Office of the Legislative Counsel drafts legislation for the Northern Ireland Assembly and the (Welsh) Office of the Legislative Counsel performs the same role in relation to the National Assembly for Wales.  In the Republic of Ireland, there is an Office of the Parliamentary Counsel to Government.  In Australia, each state, territory and the federal government has an Office of the Parliamentary Counsel.

Opposition (Australia): In Australian parliamentary practice, the Opposition or Official Opposition is usually the official title of the second largest party or coalition of parties in the Australian House of Representatives with its leader being given the title "Leader of the Opposition".  The Opposition serves the same function as the official opposition in other Commonwealth of Nations monarchies that follow the Westminster conventions and practices.  It is seen as the alternative government and the existing administration's main opponent in the Australian Parliament and at a general election.  By convention, the Opposition Leader in the federal Parliament comes from the House of Representatives, as does the deputy, although the Government and Opposition may also both have leaders in the Senate.  The Opposition is sometimes styled as "Her Majesty's Loyal Opposition" to show that, although the group may be against the sitting government, it remains loyal to the Crown (the embodiment of the Australian state), and thus to Australia.

Supporting paragraphs: Father of the Australian Parliament Parliament of Australia
Answer: Australian Parliament