The younger Madhucchandas accepted Sunahsepha as their eldest brother and told him, "We shall follow your orders." Visvamitra then said to his obedient sons, "Because you have accepted Sunahsepha as your eldest brother, I am very satisfied

Expressions researched:
"The younger Madhucchandās accepted Śunaḥśepha as their eldest brother and told him, "We shall follow your orders." Viśvāmitra then said to his obedient sons, "Because you have accepted Śunaḥśepha as your eldest brother, I am very satisfied"

Srimad-Bhagavatam

SB Canto 9

Thus the younger Madhucchandās accepted Śunaḥśepha as their eldest brother and told him, "We shall follow your orders." Viśvāmitra then said to his obedient sons, "Because you have accepted Śunaḥśepha as your eldest brother, I am very satisfied. By accepting my order, you have made me a father of worthy sons, and therefore I bless all of you to become the fathers of sons also."

SB 9.16.35, Translation and Purport

Thus the younger Madhucchandās accepted Śunaḥśepha as their eldest brother and told him, "We shall follow your orders." Viśvāmitra then said to his obedient sons, "Because you have accepted Śunaḥśepha as your eldest brother, I am very satisfied. By accepting my order, you have made me a father of worthy sons, and therefore I bless all of you to become the fathers of sons also."

Of the one hundred sons, half disobeyed Viśvāmitra by not accepting Śunaḥśepha as their eldest brother, but the other half accepted his order. Therefore the father blessed the obedient sons to become the fathers of sons. Otherwise they too would have been cursed to be sonless mlecchas.