My mom has two tumours on her head, if it is cancerous, how long would she be able to live?

She seems to forget things fairly often. Like she will ask me a question and then less than 2 hours later she will ask me the same question again cause she forgot what I said. There are times where she will ask me the same question 6 times in 2 days. My uncle is a doctor and he says the area of her head where she has the damage gets worse if the person is under stress. For example tumours at the back of the head might not be caused by stress but tumours at the front of the head are caused by stress or get worse with stress.

My mom has two tumours on her head, if it is cancerous, how long would she be able to live?
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