I don't know if Lila is a normal balanced dog or not, but she would bark like crazy. She would not bite. She barks when anyone comes into the house. I would consider this reaction normal and appropriate. I would also expect the relative, when faced with a large barking GSD would go back outside and ring the doorbell.
Lila mit der Floppy-Ohr
Teddy the Fearless
Chaz the Spaz
Pokey - you don't know what you've got 'till it's gone
Zoey - may you catch the UPS man
Auggie -may you find the peace you never had