From the Dean Martin television show, dated 12/28/1967.
By this time, the Mills Brothers had been singing together
for over thirty years, with or without their big brother John Jr.

John Sr., their father, finally retired from the group, pleading old age;
his surviving three sons continued, as the Mills Brothers,
without their father, and that is how you see them
on the broadcast of the Dean Martin show.
As with the Jack Benny show, sketch/skit dialogue has been written
so that the host can perform with the guest artists.
Note Dean Martin saying, "I have all your records" -- he meant it.
Some of Dean Martin's singing diction comes from the Mills Brothers.

Dean Martin with the Mills Brothers