Children/YA book read in 2016. Main character born to be a bone narrow donor for brother but it doesn't work - thinks parents hate him/her.

[Talia]

The main character thinks that his/her (I think his) parents hate him/her because he was born to be a bone marrow donor for his brother, but it didn’t work. The main character says that his/her mother lies in bed all day but one day he comes next to her and lies down a nod says “I love you”

[Lobstergirl, au gratin]

Talia, since we have hundreds of people looking for children's books, please add plot details (derived from what you've already written) to your header. This will help people who only have a few minutes to read through the headers.

[Kris]

A guess - There's a Little Bit of Me in Jamey by Diana M. Amadeo

Talia, how old is the main character and the brother (with leukemia?) who needs a blood marrow transplant?

Do both kids live with their parents?

I added plot details to the topic header. Feel free to update it by clicking the small "edit" link beside the header - on the full desktop website (not the mobile app).

[Lobstergirl, au gratin]

Talia, are you still looking for this or did you find it?