ANSWER:

The is referring to all types of sins that people do in secret while taking it lightly because no one can see them. 

Ibn Majah hadith 4245 It was narrated from Thawban that the Prophet ﷺ said: “I certainly know people of my nation who will come on the Day of Resurrection with good deeds like the mountains of Tihamah, but Allah will make them like scattered dust.” Is this hadith referring to masturbation or something else?

Sins | August 21, 2019 3:17 am
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I am a 20 year old man and in the past months I have turned back to Allah and I really desire to be one of his beloved servants, I have began to practice, though I have committed some disgusting sins and looked at disgusting things in the past, so I feel as if I can not be a true beloved servant of Allah again, how can I overcome this ?
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If both mom & dad introduced & encouraged sons & daughters to do haram deeds due to their ignorance but later they didn’t do this continuously for becoming religious or other cause, but sons & daughters still continues to do it in various form,still dead mom & dad will be punished in grave or sons & daughters are one & only sinners?