Biology niggas, I have a question:

Lets say two twins $A$ and $B$ get to impregnate a girl $X$ at different times. Each of those pregnancies results in one offspring, lets call them $A_x$ and $B_x$.

What is the genetic relation between $A_x$ and $B_x[/math?<br /> Clearly they are half brothers and also cousins but genetically speaking aren't they full brothers?$