I know this doesn't help you now OP, but after two decades of similar treatment, my DC don't really have a relationship with their GPs and neither do I (other than the occasional call/lunch).
My SIL, who received free childcare, holidays, and endless support (physical and financial) is now moaning that her (relatively fit & healthy) parents are looking to her to entertain them, holiday with them and support them as they head into their old age.
SIL (as an empty nester) wants none of the caring/entertaining responsibilities for her parents as she (in her own words) finds them draining and boring and wants more free time to peruse her hobbies and holiday with her DH alone.
She has been lobbying for others to pitch in, but we've just stated we're happy with the status quo.
We were regularly rejected when we invited the PIL to holiday with us as they'd rather go with SIL, so we're quite honestly able to respond that their preference is to holiday with her/her DC. She loved that when it meant free childcare every year and us never getting any, but isn't so chuffed with that situation now her DC have grown. However, that's not our problem to resolve.
That's a very long-winded way of saying, their lack of care and attention is unfair, and it will affect your relationship with them, but it will also free you and your DC from the caring burden later in life, so in many ways it's a gift.