The will takes precedence as a legal document.
The wife should draw one up by a lawyer ( to take care of all the formalities ) and then name an exec as a friend as above but NOT the lawyer -who will charge £200 /h whilst the family quarrel
If she leaves property to the husband and says Oh I want you to give it to X (a trust ) then really only X can enforce it
She can't leave property she doesnt have. - She might try to leave X's old desk to Y, but oh dear X, now dead may have already left it to someone
......
in short
so what's to say the husband has to honour her wishes!
the will ! the will correctly drawn up would
Amazingly enough some people regard wills as letters from the dead,
where their instructions are advice to be taken or not as desired.
They're not !