I have a step family should I include them?
As you go back in time, or even today, you will find that, with divorce in the present day, or in the past, when people quite often died young leaving a spouse behind with a family of young children, the incidence of multiple marriages is quite frequent. And, today, because divorce is relatively straightforward and people often marry again, they will bring with them the children of a previous marriage. And, they belong to your family unit just as much as children of the half-blood or children of the full-blood.