You say "Mia madre è una contabile"
"I am an accountant" in English is Sono un ragioniere in Italian.
Nonna
No. Rihanna's mother was an accountant.
Mother is madre in Italian, and father is padre.
Salutami tua mamma
She is a accountant.
Derek's mother, Dorothy Jeter, was an accountant.
An accountant at the bank.
Ragionere is an Italian equivalent of 'accountant'. It's pronounced 'rah-JYOH-neh-ray'. It's a masculine gender noun whose definite article is 'il' ['the'] and whose indefinite 'uno' ['a, one']. But a female 'accountant' is ragionera, which is pronounced 'rah-JYOH-neh-rah'.
Nonna, felice festa delka mamma!
Derek's mother, Dorothy Jeter, was an accountant.
The Mario brothers are Italian. "Mama Mia!" ("My Mother!") is a very common Italian interjection. English equivalents would be interjections like "Sweet mother!" or even "Holy Cow!"