In Jain view, it is possible, but not guaranteed.

If you and your mother both earn similar puṇya karma and are reborn in the same heavenly realm, then there is a possibility of meeting there. But Jainism does not give any certainty of meeting relatives after death, because rebirth depends on many karmic causes, not only family love or similar merit.

A few important points:

• Soul is separate from body and family bonds.
• Rebirth is determined by karma, so relatives may be born in different realms.
• Even in heaven, beings are not necessarily kept together as family the way we know family in the human world.
• Heaven is temporary in Jainism; it is still within saṃsāra, not final liberation.

So the most accurate Jain answer is:

Yes, it may be possible if karmas lead both of you to the same heavenly birth, but it cannot be promised or assumed.

In Jain dharma, the safest approach is to do puṇya, practice ahiṃsā, satya, aparigraha, and dedicate merit with pure भावना for your mother’s well-being.