Need Some Ears

My brother is having a baby in few months. However baby has multiple heart problems.
He/she will have to go thru multiple surgeries and changes of survival are minimal as doctor had told
Now, with multiple visits to doc , to keep/ not keep, they decided to go ahead and leave it to god.
And we do not think much about it and will deal when time comes.
Trust me we had cried a lot before and now we are thinking it as normal baby.

My problem is - each year we go to india in summers. This year we had budgeting issues and now kids passports are gone for renewal and not come yet and schools are going to start soon so it is very late for all o of us..

We had thoughts of going near diwali or post baby birth, but my mother somehow does not want me to come later.
She is like kids school will miss. And also house may be chaotic - we do not know which direction life will go .
I have bought stuff for kids etc, it will be tight and can misplace later

Others (my H) are telling me - you should go post baby. My H had other agendas as well so i do not value his suggestion. His mother is sick, he has sent loads of money. So now he does not want to go, and wants to go later this year, and mother will be bettr.

My sister telling me - to come later, for baby, assuming life will go all well.

I know i may be bone if its gets messy there. I dont want to disturb anything there. Say they have numerous Hospital visits and i come, they have to come pick me, drop me in between, etc I really do not want .
I am like nobody wants me except my parents. I want to go there leaving my kids. But I will feel like criminal doing that.
Just what would u do .