Sir Keir Starmer and his wife Victoria took their children to Poland over the weekend to learn about their Jewish heritage.
The family went to the village of Kolo, on the outskirts of Warsaw, where Lady Starmer's grandparents once lived.
Her father, Bernard, was born in Britain in 1929, after they fled to the UK in a bid to escape rising anti-Semitism in mainland Europe.
None of Lady Starmer's relatives who remained in Poland survived the Holocaust that was to come in the Second World War.
Sir Keir, who is not Jewish himself, travelled in support of his wife with their daughter, 16, and son, 18.
His wife has visited the village before, and has worked with the Holocaust Educational Trust in the UK, even hosting an event for the trust in Downing Street.
But it was the Prime Minister's first trip, which was part of a long family weekend, Jewish News reports.
It is not the first time that the couple have visited sites associated with the Holocaust.
Sir Keir Starmer and his wife Victoria took their children to Poland over the weekend to learn about their Jewish heritage (Pictured: The couple on a previous visit to Auschwitz in January 2025)
The Prime Minister has previously spoken about the importance of his children recognising their Jewish heritage (Pictured: Sir Keir and Victoria Starmer lay a wreath at Auschwitz in January 2025)
Last January, they travelled to Auschwitz in what was the PM's first trip to the death camp.
'Nothing could prepare me for the sheer horror of what I have seen in this place. It is utterly harrowing,' he said at the time.
He added that the trip made clear that the Holocaust 'took a collective endeavour by thousands of ordinary people who each played their part in constructing this whole industry of death'.
Speaking of the impact on Lady Starmer, he added that 'it was no less harrowing than the first time she stepped through that gate and witnessed the depravity of what happened here'.
Before being elected, Sir Keir spoke about how the family observe Shabbat dinners on Fridays.
He said in honour of the tradition he avoids doing work-related tasks after 6pm on Fridays, where possible.
He told Virgin Radio: 'We’ve had a strategy in place and we’ll try to keep to it, which is to carve out really protected time for the kids, so on a Friday – I’ve been doing this for years – I will not do a work-related thing after 6 o’clock, pretty well come what may.'
Sir Keir also previously told how he wanted his children, who he and his wife have kept out of the spotlight since he became the Prime Minister, to 'recognise the faith' of their grandfather's family.
He said that 'carving out that tradition, that bit of faith on Friday is incredibly important'.
In the aftermath of the terror attack at a synagogue in Manchester in October, Lady Starmer joined the PM on a trip to the venue to pay their respects and meet with the congregation after two people were killed.
