Separate e-mails to household members using one e-mail address but separate people

[CJF1]

I work with a church community.  Frequently one e-mail address is used by a household but different people are to be sent different messages such as a thank-you for each one's contribution to a parish activity.  Your program does not seem to be able to cope well with different first names, same last names and same e-mail address.  Would be nice to have the option.