Severus is hiding his family from Voldemort?

[AbendrothBlutjager]

Did Dumbledore offer Severus the same thing he offered Draco (hiding
himslef and his parents)? Unlike Draco, did Severus accept the offer?

What if Severus accepted the offer to hide his family... and they are
located at Hogwarts?

What about Irma Pince, the librarian... is she really Eileen Snape,
Severus's mother?

What about the blocked secret passageway on the fourth floor (same
floor as the library)? Is that a hiding place for Severus and his
family?

I like this idea very much.