No. The current official FAQ permits a spouse and unmarried children under 21 to be included in the initial application, with a separate processing fee and gift for each. A married adult daughter and grandchildren are not included through the couple; re-verify the official terms before paying.
Ask about your household specifically
Hypothetical example: a Hampton couple are considering this only because a married daughter and two grandchildren live in the United States, and they take it for granted that everyone travels together. The current official FAQ says an individual applicant may include a spouse and unmarried children under 21 in the initial application, but each included family member is subject to a separate DHS processing fee and gift. A married adult daughter does not fit that derivative description, and grandchildren are not included through the couple merely because of that relationship.
The daughter or another family member would need an independent basis of their own. Because the framework can change, set the household out person by person and re-check the official program page immediately before any fee or gift is paid.