I "liked" your post because I have empathy and sympathy for what you are going through. I am truly sorry for your loss and her family and friends.
My Dad died, unexpectedly, about two years ago. It was very hard on our small family.
Not trying to defend your brother, but he might not be "all there" on this matter.
Funeral homes, I genuinely have a low opinion of. I am sure that there are some doing good work in this world. My experience is that they charge a lot of money, when folks are having a hard/emotional time...I was literally told by the place that took my Dad in..."Wouldn't you want a comfortable pillow to rest his head for all eternity"? Said pillow was around $1,500.00. So you may be able to perceive my skepticism.
Dad could hold a quarter and with enough time, make it into folding money. That is, he was cheap, although he needn't be. We had his funeral and cremation I believe for around $4,000.00 and that was basic, but in accordance with his wishes.
I obviously do not know your situation, but I will say that it may be good advice to consider where your family is coming from. Loss of a parent is very tough. Even now, two years later approximately, it is still challenging for a number of reasons.
I hope and pray you find peace. Doesn't matter the age, someone who made a huge impact on your life has passed on. They are in a better place. Take comfort in this thought. Best, TH.