Julia daughter of ceaser gives pompey a son

Instead of dying Julia gives pompey a son. Within a year both pompeys other sons are dead of natural causes. What happens when two of romes most powerful men have the same heir?
 
Instead of dying Julia gives pompey a son. Within a year both pompeys other sons are dead of natural causes. What happens when two of romes most powerful men have the same heir?

Considering how quickly they are falling out at this point, nothing much would change. The child is still a baby so he's not a proper heir in Roman eyes. By the time he becomes a man at 15, Caesar and Pompey have long since gone to war.
 
Considering how quickly they are falling out at this point, nothing much would change. The child is still a baby so he's not a proper heir in Roman eyes. By the time he becomes a man at 15, Caesar and Pompey have long since gone to war.

Didn't know the baby inheritance thing
 
Didn't know the baby inheritance thing

I'm not 100% sure, but IIRC, it wasn't like in the later European period where the eldest son/surviving male was automatically heir. Romans had wills and adoptions and basically the child would only be their heir if they both said he was. Additionally, Roman bloodlines only passed through the male line so Pompey's son would have no inherent claim on Caesar's anything.
 
While a son of Julia would not have an inherent claim, I think chances are that he would indeed be Caesar's designated heir by the time the civil war starts (if we do get something resembling the OTL Civil War), although he would not be Pompey's heir for the simple reason his elder brothers Gnaeus and Sextus come first.

Pompey was Caesar's heir all up until the Civil War, at which point his will was most likely modified in 48 to remove Pompey (presumably leaving Mark Antony as his heir, but there is no concrete evidence there), and in 45, removing Antony and putting Octavian as first heir and Decimus Brutus as second.

If Caesar has a grandson from Julia (who will not have enough age to play any sort of part in the Civil War), it's more than likely that he would be named adoptive heir on account of being a much closer relative than Octavian, Quintus Pedius and Lucius Pinarius as great-nephews and Decimus Brutus and Mark Antony as very distant cousins. If OTL has played out by this stage Gnaeus Pompey is dead and Sextus is a renegade, meaning this grandson of Caesar can inherit his name and also Pompey's fortune (or whatever remains of it following the civil war).
 
From 48 to 46, Caesar's legal private heir most probably was his cousin Sextus Julius Caesar (grandson of Caesar's uncle Sextus Julius Caesar who was consul in 91) whom Caesar had named as governor of Syria and who was murdered in Syria in 46.

For the rest, I agree : Pompey already had 2 grown-up sons born in the 70's so he did not need a third son and would willingly have given this third son by Julia to this third son's grandfather who also was Pompey's brother in law.

It was a quite common practice in the roman aristocracy.

And even if Pompey had not agreed to, nothing would have prevented Caesar adopting his grandson once Pompey had been defeated or through will adoption (like he did for Octavian or like Servilia performed for her only son Brutus to maintain the patrician Servilian clan).
 
While a son of Julia would not have an inherent claim, I think chances are that he would indeed be Caesar's designated heir by the time the civil war starts (if we do get something resembling the OTL Civil War), although he would not be Pompey's heir for the simple reason his elder brothers Gnaeus and Sextus come first.

Pompey was Caesar's heir all up until the Civil War, at which point his will was most likely modified in 48 to remove Pompey (presumably leaving Mark Antony as his heir, but there is no concrete evidence there), and in 45, removing Antony and putting Octavian as first heir and Decimus Brutus as second.

If Caesar has a grandson from Julia (who will not have enough age to play any sort of part in the Civil War), it's more than likely that he would be named adoptive heir on account of being a much closer relative than Octavian, Quintus Pedius and Lucius Pinarius as great-nephews and Decimus Brutus and Mark Antony as very distant cousins. If OTL has played out by this stage Gnaeus Pompey is dead and Sextus is a renegade, meaning this grandson of Caesar can inherit his name and also Pompey's fortune (or whatever remains of it following the civil war).

You know I did kill off the pompeys elder sons in the op
 
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