I'm very sorry to hear about your loss. And welcome to the community! There's not much else to be said regarding value. As mentioned condition (grade) is a huge factor and could mean the difference between melt value (silver value) or pretty big bucks depending on the coin, mint, condition, eye appeal etc...
If you have access to a decent camera I for one would love to see pics of your
Morgan dollars (Morgan's were minted from 1878-1904 & again in 1921) as there my favorite coin to collect. And after reviewing your list they seem to be the ones with potential to be worth the most, again depending on grade/condition. So again, if you have the time and its at all possible try to post one or two coins per post, once a day, week or whatever works best for you. With both obverse (face side) and reverse (eagle) pics in the best quality you can and we can give you a pretty accurate grade and value.
When I was quite young (mid 80's) my gram and gramps did alot of world traveling and when they came back I would always sit down with grandpa and he would tell me about the country and give me coins.. Often just common, recent dated coins he got back in change while traveling... I thought it was the BEST! He would always give me wheat pennies too and my mother would get a few half dollars for me every time she went to the bank.
Anyways, my gramps passed in 1992 when I was in second grade, so the world coins stopped.. And in 5th grade our house was robbed so I lost the hundreds and hundreds of halfs I had accumulated from my mom. I never really had an interest in coins after my grandfather passed, to me the halfs were just .50 cents, I had no idea about silver, varieties etc.. The only interest in coins I had was what I could buy, lol.
So long story short, 6 years ago my gram passed, 3 years ago now my father passed

and last year my mom gave me my gramps and fathers collection.. I never even knew my dad collected coins. And wow.. It relit a spark inside of me that me gramps had started so long ago now and every time I look at the coins that were theirs I get a feeling of still being with them, like I'm continuing what they left and just hope above hope that they'd be proud of me..
I know this isn't exactly the same situation your in, but alot of people start collecting from collections left to them from family members, obviously it's totally up to you on what you choose to do with your coins, but as mentioned after doing some research on them and spending a little time with them you may just become addicted... Uuh, I mean a collector.

On a side note.. I'm not sure how old you are or if you have kids but this collection could be a great way to teach them many things: history, numbers, money, value, metals and of course your coins have the added bonus of them being dear to your mother in law, so family history and about their grandma. Even if your not into coins your kids may be someday, and it'd mean alot more to them to inherit grandmas coins than start from scratch. It'd be pretty cool for a grade school kid to bring in a
Morgan dollar from the late 1800's! He/she'd be the hit of the class!!


Good luck, and again welcome and I'd love to see some of your coins if you get a chance!