My dad was diagnosed with Multiple Myeloma 12 years ago, also a blood cancer. I suggest joining a support group with or without your MIL. The support groups offer emotional support and so many more benefits. There are people there with advice on medications, transplants (bone marrow and stem cell) what works, what doesn't, where to go for the best treatment (some hospitals are better than others for specific treament), what are the latest and greatest medical breakthroughs. Often times the support group leaders know of new advances before the oncologists. The support group leader focus on the research of one kind of cancer only, whereas oncologists treat multiple cancers. Knowledge helps you feel in control.
Light the Night walk every fall is a blood cancer fundraiser and helps you connect with others who are in the same situation you are.
Most importantly, Go to church, get connected and pray!
"I can do ALL things through Christ who gives me strength" Phil 4:13
"The joy of the Lord is my strength" Neh 8:10 Keep your joy and encourage your MIL and husband to keep theirs.
My family has fought life and death battles with my father and my husband. Praise God we still have them both! My dad was given 2 months to live 12 years ago, my husband was told 7 times "you won't be alive in the morning" (military injury). As a family of Christians we know that if dad and my husband live we win, but if they die and go to Jesus, we still win because of the sacrifice of our Savior we will spend eternity together!