WI: Louis XV Not An Only Child?

The duchesse de Bourgogne had seven pregnancies looking like this:

Miscarried Daughter (1702)
Stillborn Son (1703)
Louis, duc de Bretagne (1704-1705)
Louis, dauphin de Viennois (1707-1712)
Miscarried Child (possibly a daughter) (1708)
Louis XV (1710-1774)
Stillborn Daughter (1711)

What if these pregnancies had carried to term, or the child survived? Would the daughters take the place of the Regent's own (lets assume Fargon still "kills" the duc and duchesse on schedule in 1712)? Or might grander matches b found for them? Does this rid us of the French involvement in the War of the Quadruple Alliance? With a bevy of brothers and sisters, does Louis XV (whomever it is) grow up with less issues resulting from a lack of an immediate family in his formative years?
 
Which children would you have survive ?

If it is one of OTL Louis XV's elder brothers, then the king named Louis XV is not going to be the same as our Louis XV.

If the 3 brothers survive, there is going to be much less concern about Philip V of Spain claiming the throne as he wanted to if the line of his elder brother Louis duke of Bourgogne had gone extinct.

But the war of quadruple alliance was not only a matter of dynastics but also a matter of spanish Bourbons contesting the treaty of Utrecht.
 
The duchesse de Bourgogne had seven pregnancies looking like this:

Miscarried Daughter (1702)
Stillborn Son (1703)
Louis, duc de Bretagne (1704-1705)
Louis, dauphin de Viennois (1707-1712)
Miscarried Child (possibly a daughter) (1708)
Louis XV (1710-1774)
Stillborn Daughter (1711)


I am very curious about this list of pregnancies of the Duchess of Burgundy: from what sources did you collect?

I knew the miscarriage at Marly in April 1708, which caused the memorable scene at the carp basin; the Duchess wrote:
"Marly, May 7, 1708.
"I believe you have heard of the accident which happened to me, and which has prevented me from writing sooner, my dear grandmother; but I am now quite recovered and beginning to pick up my strength."

A blog writes about the miscarriage at the end of 1711 [a miscarriage, not a stillborn], but without citing the source:
«The French Bourbons had a much worse "annus horribilis" between spring 1711 and spring 1712. [...] First, the devout Dauphin, Louis de France, had fallen victim to smallpox in the spring of 1711 after kneeling when a priest passed by him with the sacred host. Apparently the priest had just returned from visiting a smallpox victim and passed the disease to the prince. The heir to the French throne died on April 11 at age 50, leaving the Duc and Duchesse de Bourgogne as the new Dauphin and Dauphine of France. Then to the horror of the court, the young Dauphine Marie Adelaide, grand-daughter in law of the King, and granddaughter of the late Duc d'Orleans, fell ill from the combined effects of measles, rotten teeth and possibly the early stages of pregnancy. Repeatedly bled and purged, the Princess weakened and died on 12 February 1712».

But I can not find the sources of the two miscarriages in 1702 and 1703.
In «Princesse of Versailles: The Life of Marie Adelaide of Savoy» Charles Elliot wrote only that, after a previous pregnancy ended in a miscarriage, Marie Adelaide gave birth to her first child, given the title of the Duke of Brittany, in 1704.
One pregnancy, not two.
What is your source?
Many thanks for your kindness.
 
A slightly older biography of Adelaide called "First Lady of Versailles", combined with Antonia Fraser's "Love and Louis XIV" and passing references in biographies of her father-in-law, Queen Anne, James III, and of the duke of Marlborough.

That said, it is possible that I/the historians may have conflated pregnancies.
 
I'm thinking that if there's another heart-beat between the king of Spain and the French throne, the marriage between Bretagne and Mariana Vittoria of Spain may go through. Although they'll probably want Anjou (OTL LXV) to marry as soon as possible - don't know to who, though (maybe a Lorrainer princess or someone likewise rejected for him OTL)
 
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