Basically its akin to a "generational curse" where a habitual sin is "carried" from generation to generation within a family line. Not only the sin itself but the effect of the sin as well. It can be thought of as sowing seeds in one generation which bears its fruit in future generations. There is religious controversy regarding the precision and details of its literal impact. Modern psychology bears witness to the idea at least loosely. In today's changing family dynamics (compared to the tribally clear family lines of the Hebrews of whom we get the phrase from) it may be difficult to trace clear patterns of sin via a "family tree".
The treatment of your slave for four hundred years will never be forgotten, the slave master's children's treatment in their (Injustice ) system's and court's of "LAW" today will never be forgotten, the Slave Master's children in their Demonic scheme to deprive the so called negro of a true and just freedom. ( some land in this country they built sun up to sun Down four hundred years ) to go for self, have a prison slave agenda that's growing in leap's and bound's with nothing in sight for the poor negro but crime of some kind any where a black Man turn's in this country its a crime in accordence to the slave Master's children because they feel they can bring the once slave Down with them and that threat will not allow them a fair and Just solution, which brings us to your father's sin's and your payment the complete and final destruction of America; by the might and the power of ALLAH.