Create a family portrait featuring the Simpson family with a total of eight members, including three generations:
Grandparents:
Two 60-year-old parents standing at the back, radiating warmth and wisdom.
Adult Children:
Simpson (wearing glasses), aged 28, standing in front of the parents.
His 32-year-old brother and sister-in-law, smiling joyfully.
His 25-year-old single sister, standing beside them.
Children:
The brother's son and daughter, one boy and one girl, sitting in front, full of curiosity and excitement.