Short answer
Usually yes, eligible family members can be included in a subclass 187 application, but they need to meet the family-member rules and usually cannot be granted before the primary applicant.
Family members are assessed as members of the family unit. They need to meet the relationship and other visa criteria that apply to them.
In most cases, a family member cannot be granted the subclass 187 visa before the primary applicant. The source includes family-violence related exceptions, so cases involving family violence need careful review before any simple public wording is used.