Jack only had his mum, dad (and possibly a brother?), there was only one other relative, a connected uncle who went to Eton. So not clear why MM is singled out as having to collect relatives she does not know
Yet another ridiculous and easily disproved assertion from rubicubicle.
Jack Brooksbank’s family is not exactly a famous one, and so there is no reason that anyone would know every relative who attended his wedding. But even so Wikipedia manages to list the following:
George and Nicola Brooksbank, the groom's parents
Thomas Brooksbank, the groom's brother
David Brooksbank, the groom's paternal uncle
Scott Brooksbank, the groom's first cousin
Charles Brooksbank, the groom's first cousin
Anna Brooksbank, the groom’s first cousin
Sir Nicholas and Lady Brooksbank, the groom's first cousin, once removed and his wife
Thomas Brooksbank, the groom's second cousin
Victoria Brooksbank, the groom’s second cousin