Good for you both.
I have had several friends who helped their parents and their husbands were nowhere to be seen at all and then tried to manoeuvre their wives into an organiser role when it came to their parents.
They were categorically put in their place.
In fact one ended up moving into his mothers for several nights a week such was the umbrage one friend took when it was suggested his mother move in, after he was absolutely not involved with her beloved parents dying within 18 months of each other.
I think her grief was further triggered by annoyance at him and how unavailable he had been, busy with his endless hobbies.
His mother eventually went into a nursing home and their marriage has limped on.
She tolerates him now even though he does make a much greater effort when he finally realised how tenuous his marriage really was.
Agree with @Kissingfrogs25, I would be long divorced before I would have caring duties foisted on me.
Spell it out to him OP.
It's not a popular view, but IMO men can be spectacularly selfishly motivated to avoid caring duties if they can at all.
They will ruthlessly exploit their wives, sisters, given half a chance.
It takes strong women who brook no
bullshit to ensure it doesn't happen.
OP, you have cared enough in this, your one life.