the light of somebody’s life
From Longman Dictionary of Contemporary Englishthe light of somebody’s lifethe light of somebody’s lifethe person that someone loves more than anyone else Her son was the light of her life. → lightExamples from the Corpusthe light of somebody’s life• Ixora was his only child, the light of his life.• We have a four-year-old son who is the light of my life.• His wife, while sound in mind, had taken a pillow and had deliberately snuffed out the light of his life.• LoEshe was the light of his life.