Translation:My mother and your father do not want him.
"Annem ve baban onu istemiyor." Translation: My mother and your father do not want him.
why it wasn't possible to use present continuous: my mother and your father are not wanting him.
Turkish word order. SOV - subject/object/verb.
EDITED - My mother & your father do not want him. - Correct English answer.
You ended your English answer in an adjective - "wanting."
Wanting - (adjective)
Want - (verb) "İstemek" - (verb)
Verbal suffix -mek infinitive.
İstemiyor - he/she does not want. Derived from the (verb) istemek.
Present tense continuous personal ending -yor
Verbal suffix -iyor 3rd person singular.