Looking for occasional help with twin 6 month olds girls while staying with my in-laws for 3 weeks

We will be in Nantucket from 6/14 to 7/1 house sitting for my in-laws. We have a 2 1/2 yr old son and twin 6 month old daughters. We’d love some help with the girls so we can take our son to the playground, beach, etc more freely.

The girls are very sweet, chill babies who are on a solid and consistent nap schedule!

We are completely flexible on days and timing but would love 15-20 hrs a week of help as needed. Multiples experience is great but not necessary. Generally a very relaxed family! There will be 2 dogs at the house.