Stage 4 brain tumor. Help my parents

We have just found out my father has a larger tumor and a couple smaller ones on his brain. He will be going thru surgery Thursday Feb 1st. Recovery will be a long process. He has been the hardest worker I’ve ever known. He is still the main source of income for him and my mom. Dad served his country honorably for 20+ years in the Marine Corps, Army, and Air Force. He has always been an active person and avid softball player. God has given him 5 kids and 10 grandkids from 16 years old-1 year old. He is the most loving husband, dad, grandpa, and friend anyone could ever ask for. These will be some very hard times coming up and very financially difficult for him and my mom. Please say prayers for our family and if you are able to help financially in anyway it will be a huge blessing. May God bless!