Wilhelm I of Limburg
Wilhelm I of Limburg, count of Limburg( fl. 1422–1498), son of Eberhard of Limburg.
He married Agnes von Limburg and they had issue:
Adolf of Limburg
Adolf of Limburg, count of Limburg( died 1506), son of Wilhelm I of Limburg, count of Limburg.
He married in 1487 Elisabeth von Reichenstein( d. 1529) and they had issue:
Hermann Georg of Limburg
Hermann Georg of Limburg was count of Limburg and Bronckhorst( 1540 – 1574), son of Georg of Limburg, and count of Limburg and Bronckhorst.
He married in 1554 Maria countess von Hoya und Bruchhausen( died 1612) and they had issue:
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:
Moritz Hermann of Limburg
Moritz Hermann of Limburg,( born 1664, died 1703), count of Limburg Stirum, son of Moritz of Limburg Stirum, was the second reigning count of the branch Limburg- Styrum- Styrum.
He married in 1692 countess Elisabeth Dorothea von Leiningen- Dagsburg( born 1665, died 1722), daughter of Emich Christian of Leiningen- Dagsburg and they had issue:
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:
Eberhard of Limburg
Eberhard of Limburg, count of Limburg( died before 1426), son of Dietrich III of Limburg, count of Limburg.
He married Ponzetta von Saffenberg and they had issue:
Moritz of Limburg
Moritz of Limburg Stirum (1633–1664) was the son of Hermann Otto I of Limburg-Styrum.
He was count of Limburg and Bronkhorst, Lord zu Styrum, Wisch, Borculo and Gemen.
He became hereditary banneret of the Principality of Guelders and of the County of Zütphen.
When the House of Limburg-Stirum was partitioned in 1642 in three parts, he inherited the part Styrum and became the first member of the branch Limburg-Styrum-Styrum.
He married his cousin Maria Bernhardine, daughter of Bernhard Albrecht of Limburg and Bronckhorst
and they had issue:
Henry of Limburg-Broich
Henry of Limburg- Broich(?- 1446) was the Count of Limburg- Broich from 1439- 1446.
Henry was a son of Count Theodoric IV of Limburg- Styrum.
When Count William I of Limburg- Styrum died in 1439, the County was partitioned with Henry receiving the Lordship of Broich.
Henry died in 1449 and was succeeded by William.
Hermann Otto I of Limburg-Styrum
Hermann Otto I of Limburg-Styrum, count of Limburg and Bronckhorst, lord of Styrum, Gemen, Wisch and Borculo, and from 1640 to 1644 advocate of the imperial abbey of Vreden, was born in 1592, and died on 17 October 1644.
He was the eldest son of Jobst of Limburg Stirum.

Question: Who is the paternal grandfather of Moritz Of Limburg?
Answer: Jobst of Limburg