Thutmose III was her step son as well as her nephew.
Some historians, such as Gardiner and Wilson, argue that when he grew elder, and when Hatshepsut died, in hatred he immediately mutilated her name and monuments so as to obliterate her name and memory forever.
However, other historians, such as C Nims, argue that the damage was not done until the year 42, when Thutsmose III replaced Haatshepsut's cartouche with his own. If he hated her so much, why would he wait 20 years for his revenge???
Hope that helps