Right to Choose and Informant

Hi, I'm awaiting diagnosis via the Right to Choose and had a question about the role of the informant in the process. The guidance I have come across is that an informant is required and this needs to be someone who has known you when you were 4-5 years of age. This is not possible for me, as my parents do not have the capacity to get involved, I'm an only child and since I'm 58 most of my teachers have died. Therefore, I'm wondering can someone else, such as life partner be an informant? Any guidance or insight, that anyone can provide regarding this query will be most appreciated. Thanks. 

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