"that I use for e-mail for myself and a few other family members." If the domain is dedicated to yourself, there's no problem as you can indeed add an unlimite

"that I use for e-mail for myself and a few other family members." If the domain is dedicated to yourself, there's no problem as you can indeed add an unlimited amount of domains, forwards and aliases. Sharing one account with 4 family members isn't very convenient though.