Your workaround for now is to create a company for each of the clients and
then associate multiple contacts with that company. Each contacts primary
email address will receive your communications if they are on the list
you’re sending to. Doing it this way may seem like a hassle but you can
designate the role for each of those contacts so you know which one is the
caregiver, which one is family, etc. in case you need to segment at a more
granular level. So think of company as synonymous with your client. Then
think of contacts as associates of the company/client.