Please answer the following question: Information:  - Louis de Noailles, 4th Duke of Noailles (21 April 1713 in Versailles  22 August 1793 in Saint-Germain-en-Laye) was a French peer and Marshal of France. He was the son of Françoise Charlotte d'Aubigné, niece of Madame de Maintenon, and a nephew of Marie Victoire de Noailles, daughter-in-law of Louis XIV of France.  - Louis XIV (5 September 16381 September 1715), known as Louis the Great (') or the Sun King ('), was a monarch of the House of Bourbon who ruled as King of France from 1643 until his death in 1715. His reign of 72 years and 110 days is the longest of any monarch of a major country in European history. In this age of absolutism in Europe, Louis XIV's France was a leader in the growing centralization of power.  - Philippe de Noailles , comte de Noailles and later prince de Poix , duc de Mouchy , and duc de Poix à brevêt ( 27 December 1715 in Paris -- 27 June 1794 in Paris ) , was a younger brother of Louis de Noailles , and a more distinguished soldier than his brother . He was the son of Françoise Charlotte d'Aubigné , niece of Madame de Maintenon .  - "Marie Victoire" Sophie de Noailles, Countess of Toulouse (Versailles, 6 May 1688  Paris, 30 September 1766), was the daughter of Anne Jules de Noailles, the 2nd Duke of Noailles, and his wife, Marie-Françoise de Bournonville. Her second husband was Louis Alexandre de Bourbon, Count of Toulouse, the youngest legitimised son of King Louis XIV of France and his maîtresse-en-titre, Madame de Montespan.  - Françoise Charlotte Amable d'Aubigné, Duchess of Noailles (5 May 1684  6 October 1739) was the wife of Adrien Maurice de Noailles, 3rd Duke of Noailles. She was the niece of Françoise d'Aubigné, Madame de Maintenon, and her heiress.    What is the relationship between 'philippe de noailles' and 'duke of noailles'?
Answer:
noble family