[Bug] gen 2 aren't being linked to their parents

**Describe the bug**
A clear and concise description of what the bug is.

pedigree simulator no longer gives parents to gen 2. it does it for gen 3+ in the beta version.

<img width="2075" height="1455" alt="Image" src="https://github.com/user-attachments/assets/8481575c-6517-4792-95df-f955c5e4d11d" />