>1.  Is there any sources that tells us Marshal Anderson's last name or is it 

>the same as Mihoshi's (being that the wife's last name becomes the family's 
>name)?

His name is Minami Kuramitsu (using Western name order). He has at least one 
daughter, Mitoto, who is Mihoshi's mother. He makes a cameo appearance in GXP.

You can find some information about him translated from the GXP electronic 
encyclopedia here:

http://pub135.ezboard.com/fsetosfanfrm4.showMessage?topicID=25.topic

You'll have to scroll down a little bit. If you can't get to it, let me know 
and I'll post the translation here.

There is no information about his wife or if she's alive or dead or just 
resting. :-)

Granny/Mary