people have said several stuff about the souvineer #32.
some people said that to get the #32, you must first have all the other souvineers, #1 through #32. i dont personally know if it is in the grandparents because i dont have the #32, it seems that not a lot do have them.
i think that the #32 is a rare painting.
so, to answer your question, i think that you must have #1 through #32 to be able to get the #32.
hope i helped
sincerely,Tamapal3000