WI: Heinrich VII of Germany Leaves Surviving Issue?

As it says on the tin. The King of Germany, and duke of Swabia - amongst his other titles - was the eldest son of Friedrich II, Holy Roman Emperor, and uncle to the famous Conradin. He OTL, had two sons, Heinrich and Friedrich, who both died young (although I'm not sure how wiki gets this, since he and Margarethe of Austria married in 1225 - she was older than he - and their sons' deaths are only chalked up in the 40s and 50s).

So, what if Heinrich and/or Friedrich Jnr survive their OTL deaths? How does there being another generation of Hohenstaufen rule affect the Empire? Does the Capet-Hohenstaufen alliance last? Or does it fracture? What happens when Conradin dies and/or Manfredo seizes the throne? Please discuss.
 
One thing interesting is that Frederick granted the Duchies of Austria and Styria to his eldest grandson (Fred Jr.), guess he'll get in conflict with the Zahringens.

The tricky part is how the Staufer position was pretty much crumbling since 1245 and how Frederick II's death made it faster, if Conrad IV still dies in 1254 Freddy will probably the most obvious Hohenstauffen candidate, but he'll also have many enemies, his position is even worse if he didn't claim Austria (and hold it) until then.
 
One thing interesting is that Frederick granted the Duchies of Austria and Styria to his eldest grandson (Fred Jr.), guess he'll get in conflict with the Zahringens.

The tricky part is how the Staufer position was pretty much crumbling since 1245 and how Frederick II's death made it faster, if Conrad IV still dies in 1254 Freddy will probably the most obvious Hohenstauffen candidate, but he'll also have many enemies, his position is even worse if he didn't claim Austria (and hold it) until then.

Something I don't understand - Conrad's born from Friedrich's second marriage, so why would he necessarily succeed his dad, if he has a senior nephew (assuming that said nephew isn't underage)? And might Friedrich Jnr be married to Gertrude of Babenberg to secure his hold on Austria (she was proposed to by Friedrich II, but refused and married the prince of Bohemia instead, who died a year later anyway)? Granted Gertrude's rule wasn't all smooth sailing - her aunt married Gertrude's first husband's brother as a way of getting Bohemian support for her rule - but I would think if Friedrich Jnr has a connection to the ruling house (as oppsoed to stomping in and saying "I'm duke of Austria cause my grandpa said so") could help. Maybe.
 
Because Fritz II's first son Henry rebelled against him earlier and Conrad them helped his father putting him down so he won favors with his father and got the succession.

For Austria, Frederick the Younger's mother is Margaret of Austria, one of the claimants by proximity of blood (as opposed to Gertrude with primogeniture), IOTL Margaret won by marrying Ottokar of Bohemia.
 
Because Fritz II's first son Henry rebelled against him earlier and Conrad them helped his father putting him down so he won favors with his father and got the succession.

For Austria, Frederick the Younger's mother is Margaret of Austria, one of the claimants by proximity of blood (as opposed to Gertrude with primogeniture), IOTL Margaret won by marrying Ottokar of Bohemia.

Is there a way that Heinrich (VII) doesn't rebel against his dad? Or would that require a POD butterflying his children's existence altogether? As to Austria, how could Friedrich Jnr successfully hold it? Gertrude dies perhaps? from what I can make out, she and her husband weren't altogether successful in claiming it. Would Friedrich (without Bohemian support as his mother OTL) be able to hold Austria? Or would it be difficult
 
Out of curiosity, why were the Staufens on a downward slide and was it inevitable? Can these grandsons existence (does anyone have a birth year for them?) change that? Also, Friedrich stipulated when his son by Isabella of England was born, that the boy would be his father's heir in Jerusalem, but it never happened since the boy died young. So, if that happens, might he name his younger grandson to that post (as well as the Governorate of Sicily) instead? Or would there be too much bad blood between Friedrich and his grandsons thanks to their father?
 
I've been doing some more reading, and apparently the woman who became Friedrich's third wife (Isabella of England) was previously betrothed to Heinrich. But, setting aside such a marriage for now, I've been wondering about something else:

As stated above, the Hohenstaufens were already on the way out given that they didn't last long after Friedrich II's death. But if he'd had adult aged male heirs (presumably married already (where?) in the Empire, could/would they have at the very least thrown their hat in the ring in the imperial election following his death? Or would they be reluctant to elect another Hohenstaufen prince? (I know the princes dethroned Heinrich and his sons in '35, but is it possible for them to somehow make a comeback?)
 
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