This is a very weird thread.
You haven't seen a single ambulance going into the hospital in months? Surely that's a sign that something is very deeply wrong? Or do you think heart attacks, strokes, etc. have just magically stopped happening?
I looked up some stats on pre-COVID hospital admissions via A&E (as bored), even some smaller hospital trusts in less busy areas easily see at least 10,000 admissions per month. The ambulance service handled on average a 28,000 calls per day pre-COVID.
Unless you live in a rural village and your local hospital is a tiny cottage hospital, your hospital certainly would have had ambulances in and out all day and hundreds of admissions per day prior to Covid. So if you're right and they've magically stopped, where have all those people vanished to?
Either a) you're wrong and just aren't paying attention (I live a couple of miles from a hospital and ambulance sirens are near constant) b) all the elderly/sick people who prior to this would have been taking up ambulances with heart attacks and strokes have already died/are already in hospital or c) the hospital is so overwhelmed with patients they aren't accepting ambulances and are turning patients away.
None of these options suggest Covid is less serious than it's being made out to be! In fact the opposite.
As for funerals, you can check how many funerals/cremations were held or are scheduled to be held, all this data is online. I just checked the schedule for the crematorium where my parents funeral were held and I can see that on average they've been doing six cremations a day. Have your PIL actually gone to the website of their local crematorium and found actual evidence they haven't been conducting many funerals, or are they just assuming that funerals aren't going ahead due to lack of cars, because that's just sheer ignorance.
Considering funeral information is available online it would be very easy for someone to find actual statistics and facts and figures and PROOF that crematoriums/cemeteries are not holding many funerals. The fact that no one has done so, but instead are reliant on weak second hand "well I haven't noticed any funeral cortèges on the roads lately..." says everything.