Otto Leopold of Limburg Stirum
Otto Leopold of Limburg Stirum, count of Limburg Styrum and Bronckhorst, sovereign lord zu Gemen and Raesfeld, was born in 1688 the son of Hermann Otto II of Limburg Stirum.
He became lord zu Gemen in 1704 at the death of his father, and remained until his death in 1754.
He also inherited from his grandfather Alexander IV count von
Velen zu Raesfeld the Lordship of Raesfeld.
He married in 1706 countess Anna Elisabeth von Schönborn (born 1686, died 1757) and they had issue:
Christian Otto of Limburg
Christian Otto von Limburg Stirum, count of Limburg Bronkhorst and Stirum( 1694 – 1749), was a member of the House of Limburg- Stirum and the third reigning monarch from the branch of Limburg- Styrum- Styrum.
Friedrich Karl of Limburg Stirum
Friedrich Karl of Limburg Stirum, count of Limburg Styrum and Bronckhorst, sovereign lord of Gemen, son of Otto Leopold of Limburg Stirum, was born in 1710.
He was lord of Gemen between 1743 and 1771.
He died in 1771 without descendants.
Gemen passed to his brother.
Philipp Wilhelm of Limburg Stirum
Philipp Wilhelm of Limburg Stirum( 1695 – 1758), count of Limburg Stirum, was the second son of Moritz Hermann of Limburg.
He married NN, countess von Hoensbroech and they had five children:
Ferdinand I of Limburg Stirum
Ferdinand Gotthard Meinrad of Limburg Stirum, count of Limburg," Fürst" von Styrum, sovereign lord zu Gemen, was born in 1701, son of Maximilian Wilhelm of Limburg Stirum.
He inherited the immediate lordship of Gemen at the death of his cousin the Prince- Bishop of Speyer, August Philipp of Limburg- Stirum- Gemen.
He married Katharina Karoline von Eptingen and they had one son, Ferdinand III, who died young.
Ferdinand I died in 1791 and Gemen passed to his nephew Karl Josef of Limburg Stirum.
Ferdinand IV of Limburg Stirum
Ferdinand IV August Carl Joseph Johannes Nepomuk Thaddeus, count of Limburg Styrum Zu Illereichen,( 24 September 1785- 5 December 1800) was sovereign lord of the immediate lordship of Gemen.
He was born in 1785, the son of Johann of Limburg Stirum and his wife Maria Walpurga vom Stain Zu Rechtenstein.
At the age of 13, when his grandfather Karl Josef of Limburg Stirum died, he inherited the immediate lordship of Gemen along with the associated seat on the Bench of Counts of Westphalia in the Imperial Diet.
He also inherited the fortress of Simontornya in Hungary.
With his death at the age of 15, the Gemen- branch of the House of Limburg Stirum became extinct.
Historians assume that the Styrum- branch of the House of Limburg Stirum took over his seat in the Imperial Diet.
Gemen went to Reichsfreiherr Aloys von Boineburg- Bömelberg Zu Erolsheim.
It was mediatized in 1806 to the princes of Salm- Kyrburg.
Ferdinand III of Limburg Stirum
Ferdinand III of Limburg Stirum was the son of Ferdinand I of Limburg Stirum and Katharina Karoline von Eptingen.
Born in 1753, he died at the age of 15 in 1768.
Alois of Limburg Stirum
Karl Joseph Alois of Limburg Stirum, count of Limburg Stirum from the branch Limburg- Styrum- Iller- Aichheim, was the son of Maximilian Wilhelm of Limburg Stirum.
He was born in 1685 and died in 1738.
After his father's death he became sovereign lord of Simontornya.
He married countess Maria Theresia Keglevich( died 1728) in 1722 and their children were:
Karl Josef of Limburg Stirum
Karl Josef Maximilian of Limburg Stirum, count of Limburg Styrum, sovereign lord zu Gemen, was the son of Alois of Limburg Stirum.
He inherited the immediate lordship of Gemen from his uncle Ferdinand I of Limburg Stirum in 1791 and remained until his death in 1798.
Alois having survived his three sons, Gemen passed to his grandson Ferdinand IV of Limburg Stirum.
He married Maria Anna Vogel von Wassenhofen and they had five children:
Johan Paul van Limburg Stirum
Johan Paul, Count of Limburg-Stirum (2 February 1873 – 17 April 1948) was a Dutch diplomat, member of the House of Limburg-Stirum, Governor-General of the Dutch East Indies (1916-1921), Dutch emissary in Berlin (1925-1936) and London (1936-1939).

Question: Who is the paternal grandfather of Friedrich Karl Of Limburg Stirum?
Answer: Hermann Otto II of Limburg Stirum