This is a terrible experience. People who lived as intelligent people decline to feeble people who do not recognise you.
Both my Father and my wife's Father have died. In both cases I was sad but glad. They had lived wonderful vigorous lives but at the end were people who I sometimes could not recognise.
I admit to shedding many a tear after seeing either because of this.
On the other hand I didn't shed any tears at their funerals.
Life can be very hard to explain at times.