As far as the mellow of fraternity is concerned, in Vaikuntha this rasa is represented by gaurava-sakhya, friendship in awe and veneration. The other fraternity rasa, exhibited as visrambha (friendship in equality), is found in the Goloka Vrndavana planet

Expressions researched:
"As far as the mellow of fraternity is concerned, in Vaikuntha this rasa is represented by gaurava-sakhya, friendship in awe and veneration. The other fraternity rasa, exhibited as visrambha (friendship in equality), is found in the Goloka Vrndavana planet" |"lower half of sakhya means friendship in adoration. And the higher half of sakhya rasa is friendship on equal level" |"there is the visralambha-sakhya, the higher fraternal worship of the Lord especially enjoyed by the cowherd boys"

SB Canto 4

There is the viśralambha-sakhya, the higher fraternal worship of the Lord especially enjoyed by the cowherd boys. Although there is friendship between Kṛṣṇa and the cowherd boys, this friendship is different from the aiśvarya friendship between Kṛṣṇa and Arjuna.

SB 4.24.45-46, Purport:

The inhabitants of Vṛndāvana—the gopīs, mother Yaśodā, Nanda Mahārāja, the cowherd boys, the cows and everyone else—are actually on the rāga-mārga or bhāgavata-mārga platform. They participate in five basic rasas-dāsya, sakhya, vātsalya, mādhurya and śānta. But although these five rasas are found in the bhāgavata-mārga, the bhāgavata-mārga is especially meant for vātsalya and mādhurya, or paternal and conjugal relationships. Yet there is the viśralambha-sakhya, the higher fraternal worship of the Lord especially enjoyed by the cowherd boys. Although there is friendship between Kṛṣṇa and the cowherd boys, this friendship is different from the aiśvarya friendship between Kṛṣṇa and Arjuna. When Arjuna saw the viśva-rūpa, the gigantic universal form of the Lord, he was afraid for having treated Kṛṣṇa as an ordinary friend; therefore he begged Kṛṣṇa's pardon. However, the cowherd boys who are friends of Kṛṣṇa in Vṛndāvana sometimes ride on the shoulders of Kṛṣṇa. They treat Kṛṣṇa equally, just as they treat one another, and they are never afraid of Him, nor do they ever beg His pardon. Thus the rāga-mārga, or bhāgavata-mārga, friendship exists on a higher platform with Kṛṣṇa, namely the platform of vipralambha friendship. Paternal friendship, paternal service and conjugal service are visible in the Vṛndāvana rāga-mārga relationships.

CC Madhya-lila

As far as the mellow of fraternity is concerned, in Vaikuṇṭha this rasa is represented by gaurava-sakhya, friendship in awe and veneration. The other fraternity rasa, exhibited as viśrambha (friendship in equality), is found in the Goloka Vṛndāvana planet.

CC Madhya 19.154, Purport:

Goloka Vṛndāvana is the highest planet in the spiritual world. In order to go to the spiritual world after penetrating the covering of the material universe, one must penetrate Brahma-loka, the spiritual effulgence. Then one can come to the Goloka Vṛndāvana planet. There are also other planets in the spiritual world, called Vaikuṇṭha planets, and on these planets Lord Nārāyaṇa is worshiped with awe and veneration. On these planets śānta-rasa is prevalent, and some of the devotees are also connected with the Supreme Personality of Godhead in dāsya-rasa, the mellow of servitorship. As far as the mellow of fraternity is concerned, in Vaikuṇṭha this rasa is represented by gaurava-sakhya, friendship in awe and veneration. The other fraternity rasa, exhibited as viśrambha (friendship in equality), is found in the Goloka Vṛndāvana planet. Above that is service to the Lord in vātsalya-rasa (parental love), and above all is the relationship with the Lord in the mādhurya-rasa (conjugal love). These five rasas are fully exhibited in the spiritual world in one's relationship with the Lord. Therefore in the spiritual world the bhakti creeper finds its resting place at the lotus feet of Kṛṣṇa.

1968 Correspondence

In Vaikuntha there are two kinds of transcendental mellows, dasya and the lower half of sakya rasa. The lower half of sakhya means friendship in adoration. And the higher half of sakhya rasa is friendship on equal level. So in Vrindaban the reciprocation of transcendental humor is higher than in Vaikuntha.

Letter to Rupanuga -- Montreal 3 July, 1968:

Your question, "what is the relationship of sweethearts in Vaikuntha to each other and to Lord Narayana? Is conjugal love, parental affection, and unalloyed friendship there in the Vaikunthas?" No. In Vaikuntha there are two kinds of transcendental mellows, dasya and the lower half of sakya rasa. The lower half of sakhya means friendship in adoration. And the higher half of sakhya rasa is friendship on equal level. So in Vrindaban the reciprocation of transcendental humor is higher than in Vaikuntha. It is there more free and spontaneous without any restriction arranged by yogamaya principle.