〜に言わせれば
if you ask X, according to X
Person + に言わせれば / に言わせると / に言わせたら
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に言わせれば introduces someone's personal, often strong or unconventional, opinion: 母に言わせれば、私はまだ子どもだそうだ, "if you ask my mother, I'm still a child".
It's literally "if you let X say it", which implies that X has firm views. The ending is usually そうだ, らしい or だ. With 私, it introduces your own frank opinion: 私に言わせれば、それは言い訳にすぎない, "if you ask me, that's just an excuse".
Compare によれば (N3), "according to (a source)", which is neutral and used for facts and reports. に言わせれば is always an opinion.
It's close to にしてみれば (N2), "from X's point of view", which is about someone's feelings rather than their opinion.
Examples
母に言わせれば、私はまだ子どもだそうだ。
If you ask my mother, I'm still a child.
専門家に言わせれば、この計画は無謀らしい。
According to the experts, this plan is reckless.
彼に言わせると、日本の夏は世界一暑いそうだ。
According to him, Japanese summers are the hottest in the world.
私に言わせれば、それは言い訳にすぎない。
If you ask me, that's just an excuse.
祖父に言わせれば、昔の方が良かったらしい。
If you ask my grandfather, things were better in the old days.