SB 5.9.7
atha yaviyasi dvija-sati sva-garbha-jatam mithunam sapatnya upanyasya svayam anusamsthaya patilokam agat.
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Thereafter, the brahmana’s younger wife, after entrusting her twin children — the boy and girl — to the elder wife, departed for Patiloka, voluntarily dying with her husband.