I see my elderly dad every day, and my dh and I do a lot for him. It's exhausting but I don't think he could survive independently without us now, unless he had a lot of help from carers etc. Which he won't consider yet. I also think his quality of life would be totally different without us.
My sibling doesn't live near and only visits occasionally.
My sibling has always had very strong opinions about how things should be done, and they have never been afraid to voice these. Their intentions are definitely good, but I have always struggled with their controlling approach.
My sibling is increasingly voicing opinions about things they think I should be doing for my dad. My perspective is that, they are welcome to do things their way if they want to come here and do the doing - I would love to have some respite! However, if I'm the one carrying the burden, then I don't want to be delegated to, I just want to be left to do it in my own way.