OP,
Absolutely appallingly bad.
He can organise himself for his sister's but not his wife of 30 years.
Somehow he has got it into his head that this is acceptable.
Well it wouldn't be here, married for a similar amount of time.
Down tools is exactly what you should do.
Do not capitulate and step in.
He took the time for his sister's because that was important for him.
I'm sure there are loads of little things you do for him that make his life easier.
Pull right back.
So far back that he won't know what hit him.
He needs to feel it where it counts...his comforts.
This shit is what ruins marriages, chip by chip.
It's about letting you know that you matter.
He has made it clear you are not a priority.
It most certainly is NOT about money.
So sorry OP.
Very hurtful.