Multiple email addresses / phone numbers on each customer

In the customer setup form below there is only one “email” and one “Mobile” field.

I would like to send Direct Debit and Payment requests to multiple email addresses / and/or mobile numbers for some customers. This will increase the rate of acceptance of requests.

In our case, we charge music tuition fees. Often parents will list both parents emails/mobiles for invoices.

In other applications, multiple email addresses be sent with a semi-colon between email addresses.