Question: Dhyan Sreenivasan made his debut in a film directed by his brother who is best know for his work in what?

Context paragraphs:
Best Actor (film): Best Actor is a 2010 Malayalam film co-written and directed by Martin Prakkat.  It stars Mammootty, Sruthi Ramakrishnan, Nedumudi Venu, Lal, Salim Kumar, Vinayakan, Master Vivas, Sreenivasan, K. P. A. C. Lalitha and Sukumari in major roles.  The film marks the debut of popular photographer Martin Prakatt as director.  It was produced by Naushad under the banner of Big Screen.  Several film directors made cameo appearances in the film.  The film is all about the travails of a schoolteacher who dreams of being a film actor.  It features cinematography by Ajayan Vincent, music by Bijibal and editing by Don Max.  It released on 9 December.

Adi Kapyare Kootamani: Adi Kapyare Kootamani is a 2015 Malayalam comedy horror film directed by John Varghese and starring Mukesh , Dhyan Sreenivasan, Namitha Pramod, Aju Varghese, Vineeth Mohan, Neeraj Madhav, and Bijukuttan.  The film is jointly produced by Sandra Thomas and Vijay Babu under the banner of Friday Film House and Carnival Motion Pictures.  Shaan Rahman has composed the soundtrack and background score for the film.  The film was released theatrically on 25 December 2015.

Ore Mukham: Ore Mukham (English: "Same Face" ) is a 2016 Indian Malayalam-language Mystery film directed by Sajith Jagadnandan.  It stars Dhyan Sreenivasan, Prayaga Martin, and Gayathri Suresh.  The film told in a non-linear style, is set in two periods.  One period, set in the 1980s, tells the college life of the main protagonists.  The other, set in the present day, describes the investigation into a series of murders involving the protagonists.  "Ore Mukham" released on 2 December 2016.  The film was a success in the box office.

Dhyan Sreenivasan: Dhyan Sreenivasan is an Indian film actor known for his Malayalam films.  He made his debut in 2013 with "Thira", directed by his elder brother Vineeth Sreenivasan.

Sajni: Sajni (also spelled as Sajani or Sajini) (Kannada: ಸಜನಿ ) is a 2007 Kannada film directed by Murugesh.  The film stars Dhyan, Sharmila Mandre and Anant Nag in lead roles.  lead actress Sharmila Mandre makes her Kannada debut through this film.  The film is produced by Sonali Nikhil and Sunanda Murali Manohar.  For the first time in Kannada cinema, the film features a soundtrack composed by A. R. Rahman with all compositions re-used from Rahman's Tamil film "Jodi" (which was released in 1999), of which this film is a remake of.

Sachin Movie (Malayalam): Sachin is a 2018 Indian Malayalam-language Romantic Comedy Film directed by Santhosh Nair, starring Dhyan Sreenivasan, Aju Varghese, Hareesh Kanaran Ramesh Pisarody, Sarath Appani, Renji Panicker, Maniyanpillai Raju, Juby Ninan, Kochupreman, Balaji Sarma, Nikki Galrani, Anna Rajan, Maala Parvati, Reshmi Boban, Sethu Lakshmi, Elizabeth, Valsala Menon, Lija and so on.  Sachin is a funfilled romantic film, pitched against the backdrop of cricket.  The story revolves around a boy who born on the auspicious day when Sachin Tendulkar hit his another century.  After watching Sachin's performance, Viswanathan got excited and named his son as Sachin.  The film is expected to release on January 2018.

Narendran Makan Jayakanthan Vaka: Narendran Makan Jayakanthan Vaka (Malayalam: നരേന്ദ്രന് മകന് ജയകാന്തന് വക, English: "Narendran's son Jayakanthan's property") is a 2001 Malayalam satirical film directed by Sathyan Anthikkad and written by Sreenivasan.  The story follows Jayakanthan (Kunchacko Boban), son of Narendran, who comes from Kumbakonam, Tamil Nadu, to his parents' village Paruthippara in Kannur district, Kerala, to reclaim his father's property.  The film released in August 2001 coinciding with the festival of Onam.  It was a critical and commercial success and made a theatrical run of about 100 days.  Popular Indian actress Asin made her acting debut with this film.

Kunjiramayanam: Kunjiramayanam (English: The story of Kunjiraman) is a 2015 Indian Malayalam language black comedy film directed by debutant Basil Joseph and scripted by Deepu Pradeep.  The film features Vineeth Sreenivasan, Aju Varghese and Dhyan Sreenivasan in the lead roles.  The film was released on 28 August 2015.

Thira (film): Thira (English: "Wave") is a 2013 Indian Malayalam thriller film directed by Vineeth Sreenivasan and scripted by his cousin Rakesh Mantodi.  It stars Shobana alongside debutant Dhyan Sreenivasan in the lead roles.  The film was produced by Manoj Menon under the banner ReelsMagic and distributed by LJ Films.  "Thira" was announced to be the first installment in a trilogy of thriller films.  According to Srinivasan, the film was inspired from the book "The Road of Lost Innocence: The True Story of a Cambodian Heroine" by Somaly Mam.

Vineeth Sreenivasan: Vineeth Sreenivasan (born 1 October 1985) is an Indian playback singer, lyricist, film actor, director, producer and screenwriter best known for his work in Malayalam cinema.

Supporting paragraphs: Dhyan Sreenivasan Vineeth Sreenivasan
Answer: Malayalam cinema