When Lalu was born, his father was 32 years older than his brother and his mother was 25 years older than his sister. If Lalu's brother is 6 years older than him and his mother is 3 years younger than his father, then what was Lalu's sister's age when he was born?

When Lalu was born (age 0), his brother was 6 years older than him, so brother was 6 years old. Father was 32 years older than the brother, making father 6 + 32 = 38 years old. Mother is 3 years younger than father, so mother was 38 - 3 = 35 years old. Since mother was 25 years older than sister, sister's age = 35 - 25 = 10 years. This is a standard age difference problem requiring sequential application of given relationships.