Explanation:

- Environment: Typically, this is not a direct consideration in meal planning for a family. While broader environment-related choices might influence food sources (like choosing local or sustainable foods), it isn’t a primary concern for daily meal planning.

- Nutritional need: This is crucial. Ensuring that meals meet the nutritional needs of all family members is essential for their health and well-being.

- Economic factor: Budget constraints and affordability significantly influence meal planning. Planning meals that fit within a budget without compromising on nutrition is important for most families.

- Season: Seasonal availability impacts the types of food that are fresh, tasty, and affordable. Seasonal produce is often more nutritious and cost-effective.

Environment seems the least relevant in regular meal planning, so Option 1: Environment.