The correct answer to this open question is the following.
The recorded message would be this:
"Hi, thank you for calling Mr. and Mrs. Smith home. Smith's family. Sorry, we are not home right now. Please, leave your name and number, and we will get back to you as soon as we are back. We will be happy to contact you. If it is an emergency, please dial 444 44 444 44 44. But just for extremely important things. Have a great day!
It goes like something along these lines:
Hello! Its the _________(insert last name), we are currently unable to get to the phone but we will be sure to call you back when we get a chance! Have a great day and sorry for the inconvenience!
Hope I helped :)