Verbal bequeaths

[SOULFILLY]

MY SISTER CLAIMS THAT MY MOTHER MADE A VERBAL REQUEST TO HER FROM HER DEATH BED TO GIVE EACH OF MY NEPHEWS' 10k SINCE THEY WERE NOT MENTIONED IN HER WILL. THIS MONEY WAS DISTRIBUTED TO THEM AFTER MOM'S DEATH. MY SISTER WAS THE ADMIN. OF THE LIVING TRUST WHICH STATED EQUAL PARTS TO MYSELF AND MY SISTER. WHAT ARE THE LEGAL RAMIFICATIONS IN STATE OF MARYLAND?