Key facts: Federal Garn-St. Germain Act protects heirs from immediate mortgage payoff demands; NM Statutory Probate Rules Code governs the process; $50,000 estate value threshold determines procedure type; 30-day mandatory waiting period applies to all probate proceedings; heirs become responsible for payments, taxes, and insurance upon inheritance; mortgage servicer must receive certified death certificate and formal notification; New Mexico property tax exemptions may apply for surviving spouses.