Answer

No—strictly speaking, I cannot verify that Lord Mahavira said this in the Bhagavatī Sūtra. The Bhagavatī (Vyākhyāprajñapti) belongs to the Śvetāmbara canon, while Digambara Jainism does not accept the Śvetāmbara canon in the same way as authoritative scripture. ( britannica.com)

Explanation

In Jain doctrine, birth in deva-gati happens according to karma, not because of family attachment. The Tattvārtha tradition states that celestial and infernal beings are born in special beds, while the rest are born by spontaneous generation; Jain sources also say that a soul enters a new birth according to the karmas it has accumulated in previous lives. So meeting a loved one in Devaloka is, at best, only a possibility if both souls happen to be reborn there—it is not a guaranteed promise in the strict Jain sense. ( nikkyjain.github.io)

Takeaway

Strict Digambara answer: do not present “you will meet your loved one in Devlok” as a Bhagavatī Sūtra teaching. The safe Jain position is that heavenly birth is karma-based and temporary, not a guarantee of reunion. ( jainpedia.org)