I have a joint account with siblings. I see in Turbo Tax how to split the ordinary dividends and qualified dividends by using the Nominee feature and putting in an adjustment, however, I do not see a way of handling the joint account for capital gains. The full gain/loss calculated from the joint account versus just my portion carried over on to my 1040. Other than manually going into the form and correcting, is there another way to designate capital gains adjusted for a joint account?