Part-time sitter in our home (ages 4 + 6)

We need a part-time sitter for the months of June, August, and then as-needed throughout the year (occasional afternoons, date nights, etc.) Schedule is flexible, needing someone 2-4 days per month for 4-5 hours each time. I work from home and will be upstairs, we've done this arrangement in the past without issue. Also responsible for cleaning up any childcare-related messes and preparing/serving snacks or lunch.