If/when King Charles dies, his oldest son William becomes King of England. If William should die before his time, it goes to his oldest son, Prince George. The next in line are Princess Charlotte and Prince Louis, the 2nd and 3rd children of William and Catherine. If they all died in a tragic accident (or something), the line of succession falls to Prince Harry and his children who are currently not living in Britain.
This is all supposition because William and Catherine's oldest son is already 13 years old. Prince George will probably be in his 20s or 30s when his father becomes King, and he will no doubt marry and produce heirs. So Prince George's future children would then go to the front of the line ahead of the rest of the Windsors.
It would never get to Andrew, even if he's still in the line of succession.
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