Your mother
I assume you're referring to the Majority Leader and Minority Leader. There are two because there are two major parties; each party chooses its own leader, with the party that holds the majority of seats selecting the Majority Leader.
The number of republicans and democrats on each committee are decided by the majority party. The party with more senators or representatives has more members on each committee.
majority party of each house
The majority party appoints the chairs and determines the membership of the committees. The chair has a lot of control over what the committee does.
The majority party in each house appoints the committee chairs and has a majority of the committee members, giving them control over the committee's agenda, priorities, and decisions. This allows them to influence which bills are considered, how they are debated, and whether they move forward for a full vote by the chamber.
two
The majority party appoints the chairs and determines the membership of the committees. The chair has a lot of control over what the committee does.
The number of MLA seats a political party holds varies depending on the results of the legislative elections. The party with the majority of MLAs forms the government, while the other parties represent the opposition. Each MLA represents a specific electoral district and the total number of seats in a legislative body is typically fixed.
The majority party from each house selects the chairperson for each committee.The unwritten rule of the seniority system traditionally has guided the selection of chairpersons. The seniority system gave the member of the majority party with the longest uninterrupted service on a particular committee the leadership of that committee.
In the US: 2000-2002: 50 seats for each party (Republicans had the tie-breaking vote of the Vice President) 2002-2004: Republicans (51 seats) 2004-2006: Republicans (55 seats) 2006-2008: Democrats (51 seats, with 1 independent) The Liberal Party held the majority in the Australian Senate.