Question

why do you think that the white children's attitude towards slavery is different from that of their parents

Answer 1

Because basically times change and generations have different points of views. The whit children grew up with the slaves and sometimes even befriended them causing a better relationship/positive connotation while the parents see them as property and tools to make money for them.

Answer 2

The parents may feel that slavery is okay to a certain extent because there parents raised them that way and they May have grandparents that owned some "slaves." Now children's attitudes might be different because nowadays you encounter lots of nationalities and races in the USA and were starting to adapt and open up to them wanting to know more about what they do or why they do something different than you might do.