SB 5.9.7

atha yavīyasī dvija-satī sva-garbha-jātaṁ mithunaṁ sapatnyā upanyasya svayam anusaṁsthayā patilokam agāt.
Word for word: 
atha — thereafter; yavīyasī — the youngest; dvija-satī — wife of the brāhmaṇa; sva-garbha-jātam — born of her womb; mithunam — the twins; sapatnyai — unto the co-wife; upanyasya — entrusting; svayam — personally; anusaṁsthayā — by following her husband; pati-lokam — the planet named Patiloka; agāt — went to.
Translation: 
Thereafter, the brāhmaṇa’s younger wife, after entrusting her twin children — the boy and girl — to the elder wife, departed for Patiloka, voluntarily dying with her husband.