The Origin And Reality Of The Generally Known Teeja, Chaaleeswan, Shash Mahi (Sixth Monthly) And Barsi (Yearly) Fatiha Among The Sunni Muslims:

In the book Anwar-e-Sati'ah and Hashiyah Khazanat ar-Riwayaat it is written that
Holy Prophet (Peace and Blessings of Allah be Upon Him) offered sadqah on the third, seventh and fortieth day of the martyrdom of Sayyiduna Hamzah and repeated the same at every sixth months and at the end of the year. [Anwaar-e-Sati'ah, Page 145]

This is the origin and reality of the generally known Teeja, Chaaleewan, Shash Mahi (sixth monthly) and Barsi (yearly) Fatiha among the sunni Muslims.

Imam al-Nawawi Alaihir raHma has said:

Hadrat Anas bin Malik used to gather his family members on the occasion of Khatm al-Quran and offered Fatiha, in the Presence of Allah for the welfare of all. [Kitab al-Azkaar, Baab Tilawatil Qur'an]

Hakeem Ibn Utbah says that

Once Ibn Abi Lubabah invited a group of the people and told them that he had invited them at his home because he was completing the Khatm al-Qur'an on that day so that they might benefit thereby as the dua on that auspicious occasion receives the acceptance from the Almighty Allah. [Kitab al-Azkaar, Baab Tilawatil Qur'an]

It is also reported by Hadrat Mujahid on reliable authority that

Some righteous persons used to gather the people on the occasion of the Khatm al-Qur'an and told them that on this occasion, the Mercy (Rahmat) from Allah descends upon those present there. [Kitab al-Azkaar, Baab Tilawatil Qur'an]

This provides sanction from holding the gathering on the occasions of Teejah, and Cheh'lam (Chaliswan) is a practice among the saintly persons of the Ahlus Sunnah, which is in a sense their sunnah.

In Raddul Muhtar it is said that according to a Hadith:

من قرأ الإِخلاص أحد عشر مرة ثم وهب أجرها للأموات أعطي من الأجرِ بعدد الأموات
If a person recites Surah Ikhlas eleven times and conveys its thawab to the deceased Muslims, then he himself shall receive the thawab equal to the total reward given to the souls of the deceased Muslims. [Raddul Muhtar, Qir'at lil Mayyit, Baab ad-Dafan, Vol. 1, Page 666]

It is said in the Shaami:

و يقرء من القران ماتيسرله من الفاتحة و اول البقرة و اية الکرسي و امن الرسول و سورة يس و تبارک الملک و سوره التکاثر و الاخلاص اثني عشر مرة او احدي عشر او سبعا او ثلاثا ثم يقول اللهم اوصل ثواب ماقرئناه الي فلان او اليهم
One may recite the Holy Qur'an by way of Fatiha, on any particular occasion in the following manner: In the beginning Surah Fatiha, then the first there verses of the Surah Baqrah then Ayat-ul-Kursi, the last three verses of the Surah Baqrah, then Surah Yasin, Surah Mulk, Surah Takathur and in the end Surah Ikhlas the last one recited Twelve times or Eleven times or Seven times or Three time then pray to Almighty Allah for the Eesal-e-Sawab in favour of so and so person or persons. [Raddul Muhtar, Qir'at lil Mayyit, Baab ad-Dafan, Vol. 1, Page 666]

In the above passages full procedure of the known offering of Fatiha has been outlined, which in short is that the man offering Fatiha should recite the Holy Qur'an from different places and finally pray to Almighty Allah to grant the reward of the recitation in favour of or persons concerned. Since it is sunnah to raise hand at the time of final prayer of Eesal-e-Sawab, the man should raise both palms joined together up to the shoulders. Thus the proof of the Fatiha is established