These are heady times for the world’s richest clans. : Family offices scored average returns of 15.5 per cent last year, up from seven per cent in 2016 and 0.3 per cent the prior year, according to UBS Group AG and Campden Wealth. Those in Asia led the way with a 16.4 per cent return in 2017, fuelled by soaring stock markets and private equity. This is the fifth annual survey from UBS and Campden, providing insight into the discrete world of family offices, which manage the fortunes, tax affairs and often lifestyles of the wealthy.