Yes, but under the current official FAQ a spouse and each unmarried child under 21 must be included in the initial application, and each included family member requires an additional $15,000 DHS processing fee and $1 million gift. Re-verify those terms on the official page before any payment.
Check the official family terms, then each person's facts
Hypothetical example: the couple has a married daughter of 26 and an unmarried son of 20. The current official FAQ permits a spouse and unmarried children under 21 to join when included in the initial application, with an additional $15,000 DHS processing fee and $1 million gift for each family member. The married daughter is not eligible under those family terms, while the son's age and any Child Status Protection Act treatment under the eventual EB-1 or EB-2 process require an individualized check. Confirm each person's citizenship, age and civil status with documents rather than description. Because the official terms may change, re-read the FAQ for family eligibility, charges and timing immediately before filing or transferring money. An adult child who cannot be included would need a route of their own.
Hypothetical example: a rail-signal designer plans to apply with a spouse, a nineteen-year-old child, and a married twenty-three-year-old child. Read the current official material and the governing derivative rules of the employment-based pathway before adding names to a financial plan. Birth certificates, marriage records, and each child's age and marital status settle who may qualify as a derivative. The older married child should be assumed to need an independent route unless the official process states otherwise. Also note the passport nationality of every family member because travel and document requirements can differ. A household decision should distinguish residence eligibility from a person's separate ability to work or study before residence is granted.