are half brothers siblings
There are several different types of siblings. 1  Full siblings (brother, sister): These siblings have the same father and mother. 2  Half siblings (half-brother, half-sister): These siblings have one parent that is the same. They either have the same father or the same mother. Step siblings (stepbrother, stepsister): These sibling have different fathers and mothers but one of their parents is married to a parent of the other one.