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Specific help to beautify picture

hi all,
need serious help for the pictures below.
i have no idea how editing works and would really appreciate the help.

1) I need to remove the table and the junks on it - cups, spoons, plates, plastics, etc.
2) I need to remove the people in the background. (not the childrens around the table but just removing the chinese family in the table behind)

my 3rd request is a bit extravagant but i am hoping that it wont be too much for the photo guru's.

3) is it possible to create a whole new environment where the birthday celebration took place. probably with a nicer table, cake and background?

I appreciate the help and Thank you in advance.