@jcboy,
Yeah, I know about that (long story).
Good luck on all that. Not knowing the story, much less whether she liked the stepsisters - he might end up thinking they should get something but would want control over that. Or it sounds like they might take after their father.
My long story, in short form: my aunt despised doctors and lawyers. She told me for about a year that she wanted me to have everything. I talked to an attorney friend who told me holographic wills are (or were) legal in California, and gave me the appropriate wording, which she was glad to copy and sign. That was easy. Later on, a week before she died, the neighbor took her to a lawyer and set her up in a trailer on one of the neighbor's properties a bunch of miles away. Neighbor called to tell me she died and that she was the administrator of the estate. (Criminy, I visited my aunt once or twice a week and had a quilt there so I could stay over night on occasion.)
I contested it, with the help of my friend.
This all took a few years, in which time real estate value went way down. (I wouldn't have sold it, I liked the place, old spanish style cottage, with a lot of family memories.)
The bank (whatever) person let her go through the house first. There wasn't much I wanted but old photos and family papers. The neighbor missed stuff - I got an old bracelet I know was a favorite of my aunt; I called my cousins with a list, and they each picked something. The box with photos and papers was long gone.
The property, along with adjacent properties, is now a horrible ugly set of condos. The neighbor died, neighbor's son got, I suppose, the silver.
I got a little money from it, my attorney got a little money for his help, and the whole thing was uselessly sad.
Man, oh man, I hate all that stuff.