Question #1:
Are the following which are quoted to be hadith really hadith?
1. One who visits me after my death is as if he visited me during my life.
2. One who visits my grave my intercession for him is certainly due.
A saudi scholar has mentioned in his umrah kitaab under the section of ziyarat that, although quoted to be Hadiths they are not Hadiths.
Answer #1:
Both these Hadiths are suitable to quote.