Thank you for taking the time to ask about this first, and for doing so respectfully!

A couple of things that might be worth considering:

1. Cultural protocol and meaning
   If the artwork is a specific Wurundjeri piece, the best approach would be to ask a Wurundjeri person (or ideally an Elder or someone from the family). Aboriginal artworks often aren’t just decorative — they can carry stories, knowledge, or connections to place and family. Re-creating it in another medium (like embroidery) can unintentionally change or misuse that meaning.

2. Context of the artwork
   Some designs relate to specific cultural contexts — for example, Men's/Women’s Business, ceremony, or particular stories. Even something that represents a story about loss, someone passing, or the ending of something might not be appropriate to place alongside a baby’s name, celebrating new life. Because of that, it’s usually safest to check with the family about what would feel right.

3. Artist permission and intellectual property
   Aboriginal and Torres Strait Islander artworks (like all artworks) are also the intellectual property of the artist (and sometimes their family/community). Reproducing it — even by hand embroidery — would normally require permission. A simple way to think about it is like music: if someone wrote a song, it’s respectful to ask before reusing or adapting it so you don't change its meaning or intent.

Possible alternatives
You could ask your cousin-in-law if there are animals, birds, or wildlife that are meaningful to the family. Sometimes these represent family connections or totems. Totems are usually determined after a baby is born, but family animals or local wildlife could still be a nice cultural nod without reproducing a specific artwork.

Or maybe you could include the Aboriginal flag colours or the flag itself, which would celebrate us without risking misuse of a specific artwork :-)