🔹 BASELINE: Your Son’s Blood Quantum

You are full Navajo (100%).
Your child’s mother is Filipina (0% Navajo).

➡️ Your son’s Navajo blood quantum = ½ (50%)

He qualifies for Navajo enrollment (minimum is ¼ or 25%).

Their child:

• Gets ½ from your son × 50% = ¼

• Gets ½ from full Navajo mother × 100% = ½
  ➡️ Total Navajo blood quantum = ¾ (75%)

✅ Their child qualifies for enrollment
✅ Their grandchild (if married to a Navajo) likely still qualifies
➕ This branch continues the lineage under current rules

Their child:

• Gets ½ from your son × 50% = ¼

• Gets ½ from non-Navajo mother × 0% = 0
  ➡️ Total Navajo blood quantum = ¼ (25%)

✅ Bare minimum for enrollment
⚠️ If that child marries a non-Navajo, the next generation is at ⅛ (12.5%)—ineligible for enrollment

This is where the line ends under current blood quantum rules.