Question: What is the name of the Brothers who originally Started the band Chevelle and Wrote the Song Vitamin R? 

Context paragraphs:
Vitamin R (Leading Us Along): "Vitamin R (Leading Us Along)" is a single from Chevelle's album "This Type of Thinking (Could Do Us In)".  It was their second number-one hit on the "Billboard" Hot Mainstream Rock Tracks chart and reached number three on the "Billboard" Hot Modern Rock Tracks chart.  In interviews, it has been stated that "Vitamin R" is Ritalin.  The song was written about a friend of the Loeffler brothers, who was misdiagnosed with ADHD, and developed an addiction to Ritalin.

Stoker (band): Stoker or stylised as ⚡toker is a hard rock band from Cape Town consisting of 2 sets of brothers from two rural country towns in the Western Cape.  The current line up was established in 2013 when Redge (lead guitar) and Morgan O'Kennedy (drums) joined Chris (vocals, rhythm guitar) and Jurgen Bornman (bass), the latter two having originally started as a 3-piece with drummer Joe Theron.  While establishing themselves on the local live scene over the next year, the band recorded their debut EP, "Fox in a hole" in 2014.  After several single releases during 2016 they released their eponymous full length album in early 2017 to local critical acclaim.

Joyride (Omen): "Joyride (Omen)" is a song by American rock band Chevelle.  It serves as the lead single from their eighth studio album, "The North Corridor".  The song became their fifth number one on the Mainstream Rock chart.  No music video was filmed for the track, the band opting instead to release one for the second single, "Door to Door Cannibals".

This Type of Thinking (Could Do Us In): This Type of Thinking (Could Do Us In) is the third studio album and second major label release by American alternative metal band Chevelle.  Peaking at No. 8, it charted higher on the "Billboard" 200 than its predecessor, "Wonder What's Next"; however, the album didn't manage to match its predecessor's commercial success, but was certified gold.  "This Type of Thinking" follows generally the same heavy style as "Wonder What's Next" with popular singles like "Vitamin R" and "The Clincher".  It would be the first of two records produced by Michael "Elvis" Baskette.  This was also the final album featuring bassist Joe Loeffler, who departed from the band in 2005.

The Red: "The Red" is the breakthrough single from the band Chevelle.  It is the fifth track and lead single from their major label debut, "Wonder What's Next", released in 2002.  Former Major League Baseball player Geoff Blum used "The Red" as his intro song when he came up to bat.

Films of Colour: Films of Colour are an English alternative rock band, formed in 2008 at the Academy of Contemporary Music in Guildford, Essex, England.  They originally started gigging under the name of Spires but as there were other bands already established by this name, they later changed their name to Films of Colour.  After seeing them at their second gig, they were taken under the wing of Phil Catchpole (Relentless Records) where he developed their sound and put them in the studio and finally on tour with Cage the Elephant.  Paul Carey joined the band as a Co-Manager in 2009, but when Phil Catchpole left in 2010, Paul Carey continued on and took command as their sole manager.  On 4 October 2010, the band released their first single "Actions" with the B-side "Circles" (both produced/mixed by Duncan "Pixie" Mills (Florence and the Machine).  The single was released digitally and on limited edition 7" Vinyl by Fierce Panda’s sister label – Label Fandango.  The band's sound were compared to acts such as Radiohead, Muse, Coldplay, early Bloc Party and Swedish act – Miike Snow.  Simon Williams, head of Fierce panda described the band "as the best band he's signed since Radiohead and Coldplay".  Picked up as The Guardian’s New Band of the Day, Best of Myspace Winners, The Independent newspaper’s Barometer: One to Watch and Steve Lamacq’s Favourite New Band.  There was radio support from 6 Music, Absolute Radio, BBC Radio 2 as well as holding the number 1 spot for two weeks on Amazing Radio

Stray Arrows: A Collection of Favorites: Stray Arrows: A Collection of Favorites is the first compilation album released by the American alternative metal band Chevelle on December 4, 2012.  It includes remastered versions of several hit songs, along with a previously unreleased b-side entitled "Fizgig."  The songs on the standard track listing (except for "Sleep Apnea", "The Meddler" and "Fizgig") all cracked the top 10 on the Billboard Mainstream Rock Tracks, with "Send the Pain Below", "Vitamin R (Leading Us Along)", "Face to the Floor" and "Hats Off to the Bull" all reaching the No. 1 spot.

Face to the Floor: "Face to the Floor" is the first single from Chevelle's album, "Hats Off to the Bull".  According to the band, it is a "pissed off, angry song about people who got taken by the Ponzi scheme that Bernie Madoff had for all those years."  "Face to the Floor" reached No. 1 on Mediabase's Active Rock chart, and the Mainstream Rock Tracks chart, their first No. 1 single since "Vitamin R (Leading Us Along)".

Letter from a Thief: "Letter from a Thief" is the second single from Chevelle's album, "Sci-Fi Crimes".  It was released on December 7, 2009.  Chevelle originally debuted this track on April 9, 2009 at a concert in Atlanta.  Frontman Pete Loeffler said the song is about a personal experience for the band when their gear was stolen in Dallas, and his prized red PRS guitar seen in the video for "Send the Pain Below" was stolen, along with the rest of the band's gear, and returned by a man in California who returned the guitar to PRS after learning it was Loeffler's.

Chevelle (band): Chevelle is an American alternative metal band that formed in 1995 in the Chicago suburb of Wildwood, Illinois.  The band was originally composed of brothers: Pete Loeffler (lead vocals and guitar), Sam Loeffler (drums and percussion) and Joe Loeffler (bass and backing vocals).  When Joe left the band in 2005, Geno Lenardo subbed-in as the bassist until he was replaced by Pete and Sam's brother-in-law, Dean Bernardini.

Supporting paragraphs: Vitamin R (Leading Us Along) Chevelle (band)
Answer: Pete Loeffler (lead vocals and guitar), Sam Loeffler (drums and percussion)