Does having multiple 'memorable info' answers reduce secuity?
Yes (See Caveats). Security Questions are not a great method for security. To date, the security landscape is very much moved from Send and Pray attacks, to Targeted Social Engineered tactics and attackers are motivated to dig into the personal lives of people to get at your goods.
Firstly, the implementation of Security Questions are often the relied on method for protecting forgotten/lost password/usernames. It's neither challenging nor complicated to get answers from somebody as social media is so prevalent and our psychology is such that we'd rather give people the benefit of the doubt rather than malicious intent.
Second, (As a Developer) many developers don't actually understand the process of security, the real meanings of Authentication, Authorization, and Identity, or understand the difference between Multi-Factor Authentication (MFA) and Two-Factor Authentication (2FA). Security Questions try to provide MFA, but to average coders actually end up providing a mechanisms for attackers to by-pass the whole needing a password thing.
Since, I work in the banking sector and in IS, counter point to my opinion, I will note that it's not uncommon for Banks/Companies to use a Security Question for MFA on items like logging in from unknown devices or locations and preventing session hi-jacks by coupling them with pre-selected pictures. Their intent is not around password resets, but truer MFA reasoning in that if you know your username, and know something about you (E.G Your first dogs name) than the person trying to login from an unknown location (unknown to the bank) is a higher chance of being you and should proceed. There is more reasoning behind it but yeah.