As soon as Narada Muni saw the swan, he could understand that his father, Lord Brahma, who is also known as Hiranyagarbha, was arriving. He immediately stood up with Svayambhuva Manu and his son Priyavrata to receive Lord Brahma and offer him respect

Expressions researched:
"as soon as Nārada Muni saw the swan, he could understand that his father, Lord Brahmā, who is also known as Hiraṇyagarbha, was arriving. Thus he immediately stood up with Svāyambhuva Manu and his son Priyavrata to receive Lord Brahmā and offer him respect"

Srimad-Bhagavatam

SB Canto 5

As stated in the previous verse, Lord Brahmā was accompanied by other demigods, but his specific carrier was the great swan. Therefore as soon as Nārada Muni saw the swan, he could understand that his father, Lord Brahmā, who is also known as Hiraṇyagarbha, was arriving. Thus he immediately stood up with Svāyambhuva Manu and his son Priyavrata to receive Lord Brahmā and offer him respect.

SB 5.1.9, Translation and Purport

Lord Brahmā, the father of Nārada Muni, is the supreme person within this universe. As soon as Nārada saw the great swan, he could understand that Lord Brahmā had arrived. Therefore he immediately stood up, along with Svāyambhuva Manu and his son Priyavrata, whom Nārada was instructing. Then they folded their hands and began to worship Lord Brahmā with great respect.

As stated in the previous verse, Lord Brahmā was accompanied by other demigods, but his specific carrier was the great swan. Therefore as soon as Nārada Muni saw the swan, he could understand that his father, Lord Brahmā, who is also known as Hiraṇyagarbha, was arriving. Thus he immediately stood up with Svāyambhuva Manu and his son Priyavrata to receive Lord Brahmā and offer him respect.