A private life beside a public racing name
Jos Verstappen’s January 2019 pregnancy announcement introduced Sandy Sijtsma to a wider racing audience. Her name has since appeared mainly beside his and their children’s, with little of her own early life made public. She is not a racing driver, a television personality, or Max Verstappen’s mother. She is Jos’s partner, widely described as his wife, and the mother of Jason Jaxx and Mila Faye Verstappen.
That distinction is the starting point for understanding this family. The Verstappen surname carries an enormous racing spotlight. Sandy occupies a quieter part of the picture, with no established public profession, personal interviews, or verified public social account in the material available here.
Her exact birthday, birthplace, education, and parents are not established. She was described as 44 in early 2019, but I would not turn a single reported age into a confirmed birth date or a precise current age. Privacy leaves blank spaces, and those spaces deserve to remain blank.
The relationship with Jos Verstappen
By January 6, 2019, Sandy and Jos were already an established couple. That day, Jos announced that he and his wife were expecting a son. He named Max, Victoria, and Blue Jaye as the children who would gain a baby brother.
Some contemporary descriptions used girlfriend while Jos himself used wife. Later accounts generally describe Sandy as his third wife and give 2018 as their marriage year. An exact wedding date and a marriage document are not available here, so I regard 2018 as a reported year rather than a personally verified civil record.
The language surrounding the relationship continued into 2025 and 2026, with Sandy described as Jos’s current partner or wife. There is no established public announcement of a separation. I would not infer a divorce from an isolated biographical phrase that conflicts with that wider chronology.
Sandy has not publicly narrated how they met or what their marriage is like. Their story reaches the public mainly through Jos’s announcements and occasional family accounts. That limited perspective is worth keeping in mind.
Jason Jaxx and Mila Faye
Jason Jaxx Verstappen’s arrival was announced by Jos on May 2, 2019. His birth is commonly reported as April 30, 2019, although some contemporary wording about the weekday was inconsistent. The secure points are his name, his parents, and the late April or early May announcement period.
He is Jos’s second son and fourth child. His older half siblings are Max, Victoria, and Blue Jaye. In December 2019, Max joked that his little brother would be the one driver he could accept being beaten by, using the playful language of a newer engine specification. I read that as an affectionate family joke, not a racing contract or evidence of a future career.
Mila Faye is Sandy and Jos’s daughter. Her birth year is generally given as 2020, but an exact birthday is not established in the available account. Compared with Jason’s arrival, her birth left a much smaller contemporary public trail.
Both children are minors. Their parentage and broadly reported birth timing explain their place in the family without turning childhood into a public itinerary. No verified racing results or career plans are established for either child.
The family tree in clear view
I find a simple table useful here because several different relationships can otherwise become tangled. Jos has five children from three relationships, and Sandy is the mother of the two youngest.
| Child | Published birth year | Mother |
|---|---|---|
| Max Verstappen | 1997 | Sophie Kumpen |
| Victoria Jane Verstappen | 1999 | Sophie Kumpen |
| Blue Jaye Verstappen | 2014 | Kelly van der Waal |
| Jason Jaxx Verstappen | 2019 | Sandy Sijtsma |
| Mila Faye Verstappen | 2020 | Sandy Sijtsma |
Max and Victoria are full siblings. Jason Jaxx and Mila Faye are full siblings. Across those maternal branches, the children share Jos as their father and are half siblings. That is different from being unrelated step siblings.
Sophie Kumpen, a former karting competitor, is Max and Victoria’s mother. Kelly van der Waal is Blue Jaye’s mother. Kelly Piquet, Max’s partner, is a different person from Kelly van der Waal. Similar first names should not blur these separate family roles.
Jos and the motorsport background
Jos Verstappen was born March 4, 1972, in Montfort in the Netherlands. His Formula 1 career ran across seasons between 1994 and 2003 and included two podium finishes in 1994. He later competed in A1 Grand Prix and endurance racing, including an LMP2 class victory at Le Mans in 2008.
He also played a major role in Max’s early karting development. That coaching relationship belongs to an earlier stage of the family timeline, before Sandy’s publicly documented relationship with Jos. I would not describe Sandy as having raised Max or Victoria based merely on her later marriage to their father.
Jos began rallying in 2022. In April 2025, he won the ERC Masters category on his European Rally Championship debut at Rally Sierra Morena with Renaud Jamoul. Those results describe his work. They do not establish a sporting role for Sandy.
Home work and public assumptions
One of the few substantial stories naming Sandy concerned a reported late 2023 property purchase in Amstelveen. The purchase price was given as €2,425,000, with ownership reported in her name and Jos signing the purchase contract. The accounts also said there was no mortgage.
The underlying registry record was not independently checked in the available research. This is therefore a reported transaction; the reason for the title arrangement is not established. A house price does not reveal a person’s complete finances, and there is no reliable personal net worth for Sandy.
The same care applies to her career. Professional profiles exist for people with her name, but they are not securely connected to Jos’s wife. Borrowing their employers or education would create a biography from a namesake. An unknown profession does not mean she has never worked.
FAQ
Is Sandy Sijtsma Max Verstappen’s mother?
No. Max’s mother is Sophie Kumpen. Sandy is his father’s later partner or wife and the mother of his younger half siblings Jason Jaxx and Mila Faye.
How many children does Sandy have with Jos?
They have two publicly identified children together: son Jason Jaxx and daughter Mila Faye. Their reported birth years are 2019 and 2020.
When did Sandy and Jos marry?
The year commonly given is 2018. Jos was already calling her his wife in January 2019, but an exact wedding date is not established here.
What does Sandy do professionally?
Her profession is not reliably established in the available public account.
Does Sandy have a public social media account?
No verified public account for her is established here. The pregnancy and birth announcements associated with her came from Jos’s account rather than from a confirmed account of her own.
