Here's what I just fond:

"Adolf was the fourth of six children born to Alois and Klara, but
only one of two to survive childhood."

The Others died in Childhood


Angela Hitler ½ sister
born 1883
died 1949
besides Geli, had two children:

born 1910 Leo Raubal
born 1906 Elfriede

Paula Hitler (sister of A.H.)
b. 1896
d. 1960

Doesn't say whether she had children