For those keeping track of the incest in these families, note that Ned's parents Rickard and Lyarra were cousins once-removed (they shared a great grandfather in common.) That might not seem quite so bad were it not for the fact Lyarra didn't have to change her last name when she got married...If Jon's siblings hadn't been killed, they would've been in front of him in the line of succession. Take a look at this family/marriage tree.
Most likely yes. I think in this situation it'd be down to Rhaegar to name his heir designate, since while the annulment wouldn't retroactivly make the older children bastards or necessarily strip them of any claim to the throne, it would probably downgrade from from heir apparent to heir presumptive.^ But if Rhaegar's first marriage was annulled, that would have ended the entitlement of the children from that marriage to the throne. Jon/Aegon minor becomes heir.
Quite true, but for the current generation, the rules have been changed.Just like how if Prince Charles had died as a child, Prince Andrew would've been next in line, rather than his big sister Princess Anne.

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