Should i pay- tricky dilemma

Simply be honest and say that you can't afford it, or offer a reduced amount toward the cost. If you don't say no to this the1bg you'll be expected to contribute to other things too.

If you offer a reduced contribution make it clear that you can't afford to pay toward anything else. If your extremely wealthy parents aren't prepared to purchase this for themselves, whose to say they'll make use of it anyway.

No need to feel guilty so don't allow anyone to make you feel that way.

I agree with Elizabeth27 and just be honest. However, if your parents are ‘of sound mind’ then they should fund any equipment themselves, or (imo) do without, if they won’t recognize that it would be a help. Some friends and myself have willingly bought aids and equipment for our parents who couldn’t afford them, but if people are too mean to fund themselves … that’s a different story. Sometimes, in a previous life, if a suggestion comes from a ‘professional’ it’s often acted upon.

I can only say what I would do in your position: I would tell them outright that I can not afford it.

I presume you have all had a proper conversation about why the parent will not use his/her own money? It seems especially unfair of them to expect you to contribute to something that you can not afford when the parent actually has the money to pay!

Yes I agree with Elizabeth

If parents can afford it themselves, then they should buy it.

Other sibling shouldn’t be railroading others to do it.

Don’t contribute.

Maybe different if parents were hard up.

If you do nothing then as you say there will be other expenses.
I would text if it is easier and just be honest, saying that you cannot afford it.