No, of course not Callistemon - but it does make the day-to-day stuff harder.
Having a DH who worked overseas I do know but it sounds as if two of the boys were left with their grandmother, one with grandfather and the four others went overseas with father, whether those three remained through choice or not we don't know.
Seven boys are split up, all having lost their mother not long ago, and three left behind by father, one if them autistic.
I'm not surprised the two are troubled.
I feel sorry for everyone but they are still the father's responsibility wherever he may be.