Unfortunately, I suspect Andy's relatives will get nothing. As part of his bankruptcy proceedings, Andy's royalty stream was sold off in 2003. The poor sod really did get screwed over financially by his time in The Smiths.
"The Trustee in Bankruptcy of Andrew Michael Rourke (formerly of "The Smiths") wishes to sell Mr Rourke's royalty stream. Any interested party should contact Joey Byrne, Turner Parkinson, Solicitors, Hollins Chambers, 64a Bridge Street, Manchester M3 3BA." https://www.morrissey-solo.com/article.pl?sid=03/05/09/1442255
I work for hmv and hatful of hollow is part of our 2 for 40 LP deal and is one of our bestselling. QID , MIM , Smiths are also in the deal but do not sell as well .
I think the inclusion of how soon is now helps it's popularity . we sold out of all smiths cd just after Andys passing too