Both sides are wrong.
Clearly Biden has some cognitive decline. But since he can be cogent sometimes, off and on, it seems like a classic Alzheimers which doesnt decline superfast. He wont be drooling in a wheelchair in a year. But in my opinion signs of even the early stages of Alzheimers means unfit for Elective office. Sorry. Not having short term memory is too much of a disability.
And yes, it is ok and indeed important to discuss mental decline, in your family member and in candidates running for high office. Depending on the stage of your family members decline, It may be an act of kindness to discuss some of the care issues out of their earshot. But if you are running for office, it is a complete shame for your family members not to get medical professionals to convince you not to run. We must protect our mentally fragile, especially those who have no idea they are mentally fragile.
My mom has had Alzheimers for 11 years. She knows she has trouble walking but she doesnt think anything else is wrong with her. And everything is. She also thinks she is in her 40s. And sometimes thinks she needs to get ready for school. So yeah. Biden is probably quite unfit.
Not sure how “both sides are wrong”. You aren’t applying for custodian of a local Sunday school. I don’t care if the other side brings up Trump mental capacity. It is fair game. Their “evidence” is without basis, but it it fair game nonetheless. Biden had said and done many things that should be questioned. His handlers are doing their best to keep him under wraps. He wants to be in charge of the strongest country on the planet. His fitness to do so is CLEARLY fair game