If she or he wishes to.

Question isn't clear, but ordinarily Medicare is the primary payor and your retiree coverage is secondary.

how do you contact southwestern bell benefit office

To obtain a proof of income letter for a retiree of General Electric, you can contact the Human Resources or Pension Department at General Electric. They should be able to provide you with the necessary documentation verifying the retiree's income.

A Canadian retiree can definitely move furniture to temporary residence in the US. There are no laws prohibiting this act.