Bhratr Dvitiya or Bhai Dooj

 

• Bhratr-dvitiya or Bhai Dooj is the fifth and final day of Deepavali festivity celebrated on Shukla Dwitiya of Kartik Month.  It is also known as Yama Dwitiya because Yama is worshipped by the Brother and Sister on this day. 
• Bhai Dooj or Bhaiya Dooj is a Hindu festival celebrating the unconditional bond of love between a brother and a sister. Both pray for each other's well being. 
• Lord Yama was treated by her sister Yamuna to a dinner in her house on this day. Sisters invite Brothers to have lunch/dinner on this day at their home. 

Process:
1. Brother chants 10 names of Bhagawan Yama before going to the Sister’s house for the sister's wellbeing. 

यमो निहन्ता पितृधर्मराजो
वैवस्वतो दण्डधरश्च काल: ।
भूताधिपो दत्तकृतानुसारी
कृतान्त एतद् दशनामभिर्जपेत् ।।

Yama, Destroyer, Pitr, Dharmaraja, Vaivasvata, Holder of danda, Kaala or Time, Lord of the beings, giver of results, destroyer of karmas are the 10 names with which one should remember Yama. 

2. Sister worships Bhagawan Yama & 8 Chiranjeevis before welcoming the Brother:
भ्रातुरायुष्य-वृद्ध्यर्थं
भगिनीभि: यमस्य वै
पूजनीया प्रयत्नेन
प्रतिमाश्च विधानत: ।।

For the long life of the brother, the sisters must worship Bhagawan Yama, as per the scriptural injunctions.
मार्कण्डेयो बलिर्व्यासो
हनुमान्श्च विभीषण: ।
कृपो द्रौणि: परषुराम
एते अष्टौ चिरजीविन: ।।

Maarkandeya, Bali, Vyasa, Hanuman, Vibheeshana, Kripacharya, Ashwatthaama Parashuram are the 8 Chiranjeevis

 
मार्कण्डेयो महाभाग
सप्तकल्पान्त जीवन: ।
चिरजीवी यथा त्वं हि
तथा मे भ्रातरं कुरु ।।

O Great Maarkandeya! You who are a Chiranjeevi, as you live for 7 Kalpas, may my brother also live long.  

(All the shlokas above are from Vrataraaja p.81)

3. The Brother is welcomed with Tilak & Aarti by the Sister. 
4. The Brother and Sister together worship Lord Yama, Yamuna and Chitragupta. (Shlokas are mentioned below).

एह्येहि मार्ताण्डज पाशहस्त

यमान्तकालोकधरामरेश ।
भ्रातृद्वितीया कृत देवपूजनम्

गृहाण चार्घ्यं भगवन् नमस्ते ।।

Come, Come, O Yama, son of the Sun; you that carry in your hand a noose; accept this worship offered on Bhraatrdvitiya and also arghya; salutations to you. 

धर्मराज नमस्तेऽस्तु

नमस्ते यमुनाग्रज ।
पाहि  मां किङ्करै: सार्धम्
सूर्यपुत्र नमोऽस्तु ते ।।

O Dharmaraaja, salutation to you, the elder brother of Yamuna; O son of the Sun, protect me along with your servants; salutations to you.

यमस्वसर्नमस्तेऽस्तु
यमुने लोकपूजिते ।
वरदा भव मे नित्यं
सूर्यपुत्रि नमोऽस्तु ते ।।

Salutations to you, O Yamuna, sister of Yama and honoured by people; always confer on me favours, O daughter of the Sun; salutations to you.

मसिभाजनसंयुक्तं

ध्यायेत् तं च महाबलम् ।
लेखनीपट्टिकाहस्तं
चित्रगुप्तं नमाम्यहम् ।।

I meditate on the one who has a pen and a book in his hands, 
who is most powerful. I prostrate to that Chitragupta.

5. The Brother gives gifts to the Sister. 
6. After the Pooja, the sister serves food to her brother and then has her food.   
7. Bhavishyottara Purana & Padma Purana mention, 'He who eats a meal prepared by his sister's hand on the day on which king Yama was served in this world a meal by Yamuna, through affection secures wealth and the best of food'