No, however that seems like a rather unlikely hypothetical, and
furthermore also a somewhat impossible one. If the suicider is
literally the only person capable of caring for this person,
then there is no one to argue that their suicide would be
selfish.  And even then I think it is a tricky issue. I do
believe people are entitled to a certain degree of selfish
behavior. We are allowed to look out for ourselves. If a
person's life is genuinely so utterly miserable that suicide is
an otherwise justifiable option, I have to wonder if their right
to self-interest trumps their obligation to the child/dependent.