Connie is trying to remember when her grandmother was born

Connie is trying to remember when her grandmother was born. She knows her grandmother's older brother was born in 1932, her older sister was born in 1936, and the gap between her grandmother and her sister is twice the gap between the older brother and the older sister. What year was Connie's grandma born?

GSM8K — Grade School Math 8K (Cobbe et al., OpenAI, 2021) · train #616