Illustrate your sophistication as a writer by avoiding the use of “they,” “their,” and “them” to refer to singular nouns.
When the plural pronoun is grammatically incorrect within the context of the sentence, replace with a singular pronoun, make both noun and pronoun plural, repeat the noun, use agreeing articles, or rework the sentence entirely. The pronoun must always agree in number with the noun to which it is referring.
The relationship between a healthcare professional and their patient