Tragic flaw of the Hurin family

[Mithadan]

Yes, a very good point Galadriel55. The bad luck that seemed to stalk Turin and his family does seem to affect those around them. The examples you offer, Beleg, Hunthor, Mim and especially Gwindor, are just the top of a long list.

The wording of Morgoth's curse is relevant here. There is a marked difference between what appears in the Silmarillion and what is said in the Children of Hurin (and, unfortunately, I cannot put my hands on Unfinished Tales right now). The Silmarillion barely summarizes the curse, stating that "Morgoth cursed Hurin and Morwen and their offspring, and set a doom upon them of darkness and sorrow..." This, on its face, might not extend past the family itself. In contrast, Children of Hurin sets out an extended dialogue between Hurin and Morgoth. In relevant part, Morgoth is quoted as follows:

"But upon all whom you love my thought shall weigh as a cloud of Doom, and it shall bring them down into darkness and despair. Wherever they go, evil shall arise. Whenever they speak, their words shall bring ill counsel. Whatsoever they do shall turn against them. They shall die without hope, cursing both life and death."

Maybe this explains why Turin and his family seemed to shed ill-fate like a duck sheds water?