Supporting relatives is a tough question as it brings up all sorts of emotional and moral issues. My belief is to stick to the airline safety instruction of 'put your mask on before assisting others'. So, if providing financial assistance to others fits within your means, then by all means, help away. I, however, don't believe there's an obligation to support other adults.
Every family is different, but my family tends to give support in non-financial ways. The financial costs of my Dad's long-term care is handled by my Mom, but there's a family member with him every day. My Mom is excellent at handling money so I don't anticipate ever needing to support her.
/start rant
However, I do have a sister who is notoriously bad at money. Throughout her life she's needed bailout after bailout. Because of my limited means, I was the first to withdraw my financial support although as a 14 year old I used to give her money on a weekly basis when she was a full-time employed, married 24 year old woman! One by one the other members of the family have dropped out, seeing that their money went to trips, tattoos, exotic pets and other non-essentials. We also tried giving her goods such as needed furniture directly, or gift cards, but those were cashed in and spent on more crap. The final straw was finding out that the money we had gifted to her children, in a trust account that she had control over, mysteriously disappeared. All in all, my sister blew through over $100K. Honestly, all that 'help' did nothing. It was only when we stopped enabling her that she had to step up, grow up and deal. We three younger siblings are now on the cusp of retirement with healthy investment plans and pensions, while she is still mired in credit card debt with no assets whatsoever. Once we all retire and she realizes she essentially will never be able to retire, I'm sure there will be wailing and moaning. /end rant
In short, I'm all about choices and consequences. If I've chosen to live frugally for decades in order to build up my 'stash, that's my choice and I don't expect anyway to pay for spendypants luxuries. If you've chosen to live outside your means and now can't afford to retire, so be it.
Having said that, illness or other issues can be a game-changer. I just don't have a lot of sympathy for self-induced misery.