I don’t understand what his wife and her family and their wealth has to do with him doing his job.
He is Chancellor of the Exchequer. He is responsible for making decisions on the government's business and tax policies. His wife's family are huge business owners and investors. No-one is saying that Sunak would make decisions to deliberately favour their interests, but it surely must be right that he declares these 'possible' influences on his decisions.
Also interesting to note that his father-in-law's company, Infosys, of which Sunak's wife is a major shareholder, has been a government contractor since 2015.
(I'm getting all this from the Guardian article, which I suggest people read: www.theguardian.com/politics/2020/nov/27/huge-wealth-of-sunaks-family-not-declared-in-ministerial-register It's in other papers, too)
I don't want this to sound like the politics of envy, because although the thought of that wealth is staggering I don't particularly grudge it to them. But I do think that the milieu to which he is accustomed won't help to promote any understanding of the problems of the poor or the 'just managing'.