Targaryen royal death symmetry

[little cup]

Is this a thing? You kill Targaryen(s) of royal blood in the books and you are later killed but you kill your killer(s). Would this apply to Jon, sending Maester Aemon off on the voyage that killed him? Dany and her unborn child?

[The Commentator]

There is certainly the tools of literary fiction at work in the novels.  Irony, symmetry, parallel plot lines, heroine's journey, hero's journey, numerology, uncertain history.  What you are asking though is very specific and I just don't know.  Jon sends Aemon off.  Aemon dies.  Jon gets killed by the men of the watch.  Rhaego was murdered.  Dany executes MMD.  Robert kills Rhaegar.  Lancel kills Robert via the boar.  I don't see a pattern but I do see a weak correlation which can be explained by consequence.  I may be able to say that had Aemon been at the Wall, he may have managed to talk Jon away from getting involved with Arya and Ramsey's domestic business.  If MMD had not murdered Rhaego she would still be alive.  If Robert had lost to Rhaegar he would have died in that river or gotten executed for treason instead of getting killed by Lancel 16 years later.