The correct option is A Is
Firstly, we need to identify the tense. Since the sentence states 'alive now,' we know we must use the present tense. This eliminates options C and D. In this sentence, there are two subjects: father and mother. So ideally, the verb should be plural. But when we use 'neither...nor' in a sentence which has singular subjects (father and mother), we must use the singular verb (is). Hence, the correct option is A) is.