Question: How many Royal families did Empress Matilda belong to?

Context paragraphs:
Koliya: The Koliyas were Kshatriya of the Adicca (Iksvaku) clan of the Solar Dynasty during the time of Gautama Buddha.  The family members of these two royal families married only among themselves.  Both clans were very proud of the purity of their royal blood and had practised this tradition of inter-marriage since ancient times.  For example, Suddhodana's paternal aunt was married to the Koliyan ruler Añjana.  Their daughters, Mahamaya and Mahapajapati Gotami, were married to Śuddhodana, the chief of the Sakyans.  Similarly, Yashodhara, daughter of Suppabuddha, who was Añjana’s son, was married to the Sakyan prince, Gautama Buddha.  Thus, the two royal families were related by marriage bonds between maternal and paternal cousins since ancient times.  In spite of such close blood-ties, there would be occasional rifts between the two royal families, which sometimes turned into open hostility.

Rout of Winchester: In the Rout of Winchester (14 September 1141) the army of imprisoned King Stephen of England, led by his wife, Queen Matilda of Boulogne, Stephen's brother Bishop Henry of Blois, and William of Ypres, faced the army of Stephen's cousin Empress Matilda, whose forces were commanded by her half-brother Earl Robert of Gloucester.  After Empress Matilda's army besieged a castle on the edge of Winchester, Queen Matilda's army arrived and blockaded the Angevin army within the city.  Cut off from supplies, the Angevin army gave up the siege, then was crushed as it began to retreat.  Robert of Gloucester was captured and was subsequently exchanged for Stephen, who was returned to the throne of England.  However, the civil war known as The Anarchy dragged on with neither side gaining an advantage.

Geoffrey Plantagenet, Count of Anjou: Geoffrey V (24 August 1113 – 7 September 1151) — called the Handsome or the Fair (French: "le Bel" ) and Plantagenet — was the Count of Anjou, Touraine, and Maine by inheritance from 1129 and then Duke of Normandy by conquest from 1144.  By his marriage to the Empress Matilda, daughter and heiress of Henry I of England, Geoffrey had a son, Henry Curtmantle, who succeeded to the English throne as King Henry II (1154-1189) and was the first of the Plantagenet dynasty to rule England; the name "Plantagenet" was taken from Geoffrey's epithet.  His ancestral domain of Anjou gave rise to the name Angevin for three kings of England (Henry II his son and heir, and Henry's sons Richard and John), and what became known as the Angevin Empire in the 12th century.

Rama Varma: The name Rama Varma refers to a number of persons from many royal families of Kerala, including many members of the Cochin Royal Family:

Royal Insight Forum: The Royal Insight Forum is an online discussion forum covering topics relating to the institution of monarchy in the modern world, and offering updates on the happenings in the many royal families of the world.  The forum also provides sections where users can debate and share their thoughts and resources on royal history, royal traditions and protocol, and other royalty-related topics.

John Marshal (Marshal of England): John FitzGilbert the Marshal of the Horses (c. 1105 – 1165) was a minor Anglo-Norman nobleman during the reign of King Stephen, and fought in the 12th century civil war on the side of Empress Matilda.  Since at least 1130 and probably earlier, he had been the royal marshal to King Henry I.  When Henry died, John FitzGilbert swore for Stephen and was granted the castles of Marlborough and Ludgershall, Wiltshire during this time.  Along with Hamstead Marshal, this gave him control of the valley of the River Kennet in Wiltshire.  Around 1139, John changed sides and swore for the Empress Matilda.  In September 1141, Matilda fled the siege of Winchester and took refuge in the Marshal's castle at Ludgershall.  While covering her retreat from Winchester, John Marshal was forced to take refuge at Wherwell Abbey.  The attackers set fire to the building, and John lost an eye to dripping lead from the melting roof.

Empress Matilda: Empress Matilda (c. 7 February 110210 September 1167), also known as the Empress Maude, was the claimant to the English throne during the civil war known as the Anarchy.  The daughter of King Henry I of England, she moved to Germany as a child when she married the future Holy Roman Emperor Henry V.  She travelled with her husband into Italy in 1116, was controversially crowned in St. Peter's Basilica, and acted as the imperial regent in Italy.  Matilda and Henry had no children, and when Henry died in 1125, the crown was claimed by Lothair II, one of his political enemies.

Funeral of King Edward VII: The funeral of King Edward VII of the United Kingdom of Great Britain and Ireland.  and Emperor of India occurred on Friday, 20 May 1910.  It was one of the largest gatherings of European royalty ever to take place, and one of the last before many royal families were deposed in World War I and its aftermath.  (King Manuel II of Portugal would lose his throne much sooner, in October of that year.)

Kerala Varma: The name Kerala Varma may refer to many people from many royal families from the Indian state of Kerala.

Pueyrredón (surname): The Pueyrredón surname has its origins in 13th century France.  Initial variants were Puyredón, Puiredón, Puecheredón and Puitredón.  The etymology comes from "Podium Rotundum".  "Puy" ("podium" in Latin) means mountain or hill, and "redón" means round.  So, Pueyrredón" would mean "rounded hill".  It was used at the Languedoc to name "puy" (podium) any lonely mountain.  As such structures were strategically useful for the construction of castles, many royal families had names with the "Puy" element in them.

Supporting paragraphs: Geoffrey Plantagenet, Count of Anjou Empress Matilda
Answer: 24