Marketing emails to secondary email addresses

We are a retirement community and market primarily to couples who each have their own email address but are really one customer. We also market to adult children and their parents who each have their own email address but are really one customer. Either way, only one receives our marketing email blasts like newsletters. This is making some of our clients very frustrated. By not sending emails to all people in their contact, some have said we are not being inclusive. This does not support our ongoing journey and commitment to strive to create a diverse and equitable environment for our residents, staff, affiliates, and visitors.