Grifo
Grifo (726–753) was the son of the Frankish major domo Charles Martel and his second wife Swanahild.
After the death of Charles Martel, power may well have been intended to be divided among Grifo and his half-brothers Pepin the Younger (Pepin the Short) and Carloman.
Grifo, considered illegitimate by Pepin and Carloman, was besieged in Laon by his half-brothers, captured, and imprisoned in a monastery.
On his escape in 747, his maternal great-uncle Duke Odilo of Bavaria provided support and assistance to Grifo, but when Odilo died a year later and Grifo attempted to seize the duchy of Bavaria for himself, Pepin, who had become sole major domo of the Frankish (Merovingian) Empire upon Carloman's resignation and retreat into a monastery, took decisive action by invading Bavaria and installing Odilo's infant son, Tassilo III, as duke under Frankish overlordship.
Grifo continued his rebellion, but was eventually killed in the battle of Saint-Jean de Maurienne in 753, while Pepin became king of the Franks as Pepin III in 751.
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Charles Martel
Charles Martel (688 – 22 October 741) was a Frankish statesman and military leader who, as Duke and Prince of the Franks and Mayor of the Palace, was the "de facto" ruler of Francia from 718 until his death.
He was a son of the Frankish statesman Pepin of Herstal and Pepin's mistress, a noblewoman named Alpaida.
Charles successfully asserted his claims to power as successor to his father as the power behind the throne in Frankish politics.
Continuing and building on his father's work, he restored centralized government in Francia and began the series of military campaigns that re-established the Franks as the undisputed masters of all Gaul.
According to a near-contemporary source, the "Liber Historiae Francorum", Charles was "a warrior who was uncommonly  effective in battle".
Much attention has been paid to his success in defeating an Arab invasion in Aquitaine at the Battle of Tours.
Alongside his military endeavours, Charles has been traditionally credited with a seminal role in the development of the Frankish system of feudalism.
At the end of his reign, Charles divided Francia between his sons, Carloman and Pepin.
The latter became the first king of the Carolingian dynasty.
Charles' grandson, Charlemagne, extended the Frankish realms, and became the first emperor in the West since the fall of Rome.

Question: Who is Grifo's paternal grandmother?
Answer: Alpaida