Wow, I am thrilled with the questions from you guys. I'll try to answer as many as I can now, and will get back to you on the others.
Regarding the wealth of Alice and William Parsons - Alice was by far wealthier than William, having inherited from more than one wealthy relative. The squab farming was fairly lucrative, but I've always thought it was just something for them to do, i.e., William Parsons wanted to be a "gentleman farmer." I do not think the squab paste recipe played any factor in Alice's murder except for the fact that William was in NY the day Alice "disappeared" in order to meet some Russians who had a squab paste recipe. William's family wealth remained fairly substantial in spite of the financial problems of the day.
Regarding the ages of the parties, I don't have my notes but I'm pretty sure Alice was 37, William was 39 and Anna was in her early to mid 30's.
Regarding Roy and whether or not he might have been a party to Alice's disappearance, that is a question that has bothered me a great deal. He was 11 when she disappeared, and photos of him show a tallish, thin, serious looking young man. I've spoken to his widow who vehemently denies Roy (or Anna) had anything to do with this matter. But then, what else could she say?
The FBI made Roy write his name over and over, literally thousands of times. He also had to provide other writing samples. I think this is because they suspected he may have written the ransom note. I am hoping to get this clarified when I finally look at the case file in Suffolk County, NY later this year. I don't know what role Roy played in this mystery, but I don't think he was involved from the beginning. His involvement was probably more like not giving any incriminating information to the police, etc. I don't see him involved in the removal of Alice's body. Anna was a strong woman who was no stranger to manual labor, and to me it is possible she dealt with Alice by herself.
Regarding the trip to the train station - At first I was very fond of the idea that William and Anna had killed Alice the night before, and Anna masqueraded as Alice the next morning. But it turns out Alice purchased gasoline after dropping William off at the train station . The attendant knew her well and identified her beyond any doubt as being Alice.
About the ransom note - I'll have to look up the exact wording. I know it was fairly short, indicated the amount of money wanted and where to meet. The note was handwritten on inexpensive lined paper. The first note was addressed to William Parsons - calling him "Bill". Later notes were mailed to the house to Anna's attention, which is one of the stranger parts of this odd mystery.
Someone asked about how William Parsons returned home from the train station that night - he took a cab after waiting a while for Alice to appear.
Regarding William's move to California, there was no business reason for him to do so. He just wanted to get out of the limelight.
The Parsons home burned down quite some time ago. I do not know how thoroughly the basement was searched, which is another reason why I am anxious to review the police files.
Finally, I have never been able to get a firm handle on William Parsons. He was well-educated and from a very influential family, but he did not appear to have done much with his life. I suspect he may not have been the smartest fellow ever to have graduated from Yale. He worked for a short while for the family paper business, then after marrying Alice (when she was 25 years old), he "retired" to be a poultry farmer.
After moving to California, William got involved in lettuce farming, but I've been able to learn very little about his life after he and Anna married.
Well, guys, I hope this answers a lot of your questions. As soon as I can, I'll post the contents of the first ransom note.