And of course you do the return for free, because it's not professional to charge people for unnecessary work.  But this is not a situation where a return is not required -- for one thing, there would probably be tax due, were they not filing a joint return.  It is a situation where the zero bracket for ltcg and qd applies.

The AUR program for IRS was more of a problem back when cost basis was not reported on the 1099-B.  That may be the situation here, if the brokerage account has just been sitting there for more than 10 years.