In the incarnation of Lord Krsna, Aniruddha appeared as the son of the Lord. Lord Krsna in Dvaraka is the Vasudeva expansion of the original group. The original Lord Krsna never leaves Goloka Vrndavana

Expressions researched:
"In the incarnation of Lord Kṛṣṇa, Aniruddha appeared as the son of the Lord. Lord Kṛṣṇa in Dvārakā is the Vāsudeva expansion of the original group. The original Lord Kṛṣṇa never leaves Goloka Vṛndāvana"

Srimad-Bhagavatam

SB Canto 3

Lord Rāma is the original Vāsudeva, and His brothers were Saṅkarṣaṇa, Pradyumna and Aniruddha. Aniruddha is also the cause of Mahā-Viṣṇu, from whose breathing the Ṛg Veda appeared. All this is nicely explained in the Mārkaṇḍeya Purāṇa. In the incarnation of Lord Kṛṣṇa, Aniruddha appeared as the son of the Lord. Lord Kṛṣṇa in Dvārakā is the Vāsudeva expansion of the original group. The original Lord Kṛṣṇa never leaves Goloka Vṛndāvana. All the plenary expansions are one and the same viṣṇu-tattva, and there is no difference in Their potency.

SB 3.1.34, Translation and Purport

May I inquire whether Aniruddha is doing well? He is the fulfiller of all the desires of the pure devotees and has been considered from yore to be the cause of the Ṛg Veda, the creator of the mind and the fourth Plenary expansion of Viṣṇu.

Adi-caturbhuja, the original expansions from Baladeva, are Vāsudeva, Saṅkarṣaṇa, Pradyumna and Aniruddha. All of Them are viṣṇu-tattvas, or nondifferent Personalities of Godhead. In the incarnation of Śrī Rāma, all these different expansions appeared for particular pastimes. Lord Rāma is the original Vāsudeva, and His brothers were Saṅkarṣaṇa, Pradyumna and Aniruddha. Aniruddha is also the cause of Mahā-Viṣṇu, from whose breathing the Ṛg Veda appeared. All this is nicely explained in the Mārkaṇḍeya Purāṇa. In the incarnation of Lord Kṛṣṇa, Aniruddha appeared as the son of the Lord. Lord Kṛṣṇa in Dvārakā is the Vāsudeva expansion of the original group. The original Lord Kṛṣṇa never leaves Goloka Vṛndāvana. All the plenary expansions are one and the same viṣṇu-tattva, and there is no difference in Their potency.