It is interesting that he always focusses on his maternal grandmother - who seems to have had the least advantaged upbringing. Much less said about the senior civil servants, engineers, doctors within his family.
The narrative is clear - rags to riches. But the reality seems rather different - a multigenerational highly educated upper middle class professional family who value education and for various reasons have been double migrants (India to East Africa and East Africa to UK). But it would appear in both cases the move was managed with the safety net of knowing that their professional positions would see them right. Actually more than just hope as it would appear that there were specific schemes to move people within the civil service from country to country.
So as a family they have moved from professional upper middle class to super-rich uber-establishment. Now I'm not denigrating that - good on them - given my professional you'd expect me to be in favour of education and hard work paying off. The point is that it isn't the rags to riches story that the carefully curated portrayal from Sunak would like to give.
If you have evidence that the other side of Sunak's family - the doctors and engineers and civil servants set up a fund for Sunak's grandmother to use for her life in the UK, now would be the time to present it.
Otherwise, it would appear that Sunak's grandmother, who got married age 16, and the line that followed made it because she got a job as a bookkeeper, her husband was apparently in work when he came over and the civil service provides job security, they focused on education, and their daughter went to university and qualified as a professional and married another professional and they worked really long hours in their own business and sacrificed to pay for their own kids to go to private schools. Sounds like a good aspirational story for the British public that could easily apply to any of them - work hard at school, join the civil service in the 1960s or become a bookkeeper, keep working hard, progress in your job, save money, instill the value of education in your children so they get qualifications to get relatively well-paying jobs,, keep costs low, buy a house, benefit from the equity rise in houses, sell and buy another house etc etc