In the traditional Jain story of Bhagwan Neminath’s vivah‑baarat, the main accepted point in both Shwetambar and Digambar traditions is:

• Many animals and birds were tied and kept in enclosures.
• They were collected to be killed and served as feast for the wedding.
• Nemi Kumār heard their loud, painful cries, asked the reason, came to know they were to be slaughtered, and from deep dayā (compassion) and vairāgya (detachment), he immediately turned the baarat back, freed the animals, and renounced the world. ( jainknowledge.com)

About your specific doubt:

> “These animals were not meant for killing for feast but they were crying to meet their parents”

This line (that they were only crying to meet their parents and not for fear of being killed) is not the standard description in Jain scriptures and traditional kathā.

• The core Jain teaching from this episode is ahimsā: the animals were to be killed for the wedding feast, and their suffering awakened Neminath’s compassion.
• That they were separated from their families, mothers–children, etc., is often mentioned to show the depth of their pain, but this is in addition to, not instead of, being collected for slaughter.
• So saying, “they were not meant for killing” is not correct according to the usual Jain narrative.

In simple form:

1. Animals and birds were captured for the marriage feast.
2. They were crying in fear and pain, many separated from their families.
3. Seeing this, Nemi realized: “My happiness cannot be built on the killing and suffering of other jīvas.”
4. He cancelled the marriage, freed them, and took dikshā, later becoming the 22nd Tirthankar.

So:

• Yes, it is very much a story of mothers and children, and many other jīvas, suffering.
• But they were meant to be killed, and that is a central part of the Jain version; changing that would weaken the ahimsā message of this leelā.

If you wish to read more about Neminath Bhagwan’s life and Girnar tirth, you can read here and here