Strict answer: No, attachment to your mother by itself is not a path to heavenly realm.

In Jain Dharma:

• Attachment (rāga / moha) binds karma.
• Heavenly birth happens due to puṇya karma, not due to attachment.
• If attachment is strong, it can increase bondage and obstruct higher spiritual progress.

So the clear Jain answer is:

Attachment is not the cause of heavenly realm; it is a bond that binds karma. For moksha, attachment must be removed.