His or Hers – su
(Pronounced soo)
To remember that his/hers is pronounced soo (su) in Spanish, use the following mnemonic:
Note: Their/His/Her all translate to the word Su.
They had his and hers suits (su).

Examples of su (his/hers) in a sentence
Su perro es muy simpático.
(His dog is very friendly.)
Su casa es muy grande.
(Her house is very big.)
Su trabajo es muy importante para él.
(His job is very important to him.)