Canto 2 -
Ayodhyā-kāṇḍa
Chapter 8: The Conversation Between Kaikeyī and Mantharā
Text 2.8.34

एवं ते ज्ञातिपक्षस्य श्रेयश्चैव भविष्यति।
यदि चेद्भरतो धर्मात्पित्र्यं राज्यमवाप्स्यति॥

evaṁ te jñāti-pakṣasya śreyaś caiva bhaviṣyati
yadi ced bharato dharmāt pitryaṁ rājyam avāpsyati

evam = thus; te = your; jñāti-pakṣasya = relatives; śreyaḥ = benefitted; ca eva = also; bhaviṣyati = would be; yadi cet = if; bharataḥ = Bharata; dharmāt = by dharma; pitryam = His father’s; rājyam = kingdom; avāpsyati = gets.

Thus, if Bharata gets His father’s kingdom by dharma, your relatives would also be benefitted.

[Mantharā wanted that] Bharata get his father’s kingdom by dharma, that is, with his permission.