Apologies in advance.. this is probably going to be long.
My parents are both in their 70s, Dad is 78 and mum is 74. Before Covid hit we had started to notice some concerns about my Dad - confusion over things, forgetfulness. He had a brain scan at the hospital and they said no concerns.
Anyway, over the last 18 months things have got a lot worse. We visited over the weekend (we live 90 minutes away) as my brother and his kids were visiting - they live a lot further away and can only visit every 6 months or so, especially given covid restrictions. We all went out for a pub lunch, adults at one table, children (teenagers) at the other.
Dad must have asked Mum what she was choosing from the menu about 6 times, she gave the same answer each time and he just wasn't remembering. He asked her twice who the boy with the dark hair was - it's my youngest DS, he just didn't recognise him out of context in the pub, sitting with his cousins. And even when Mum said "that's Dave, your grandson, Ann and Jim's son", he was clearly still confused. DS has grown a lot and he comments on this very frequently, he seems stuck with DS as a 6 year old not as a teen. Dad is better in his own home with just mum or one of us visiting - take him out of that and stick him in an unfamiliar situation with lots of other people and he just can't cope.
He's also starting to struggle with things like putting his shoes and jumper on, shuffles along rather than walking.
The big elephant in the room is his alcohol use. During the day when he's not drinking he is docile and fairly compliant with mum if she corrects him or reminds him to do something. If he's had a drink he gets so argumentative and shouty with her (and anyone else). We didn't stay over as we drove home after lunch but brother did and said it was pretty awful in hte evenings. He is drinking a LOT. This is not necessarily anything new but he'll have a couple of glasses of wine at lunch, a wee bottle of beer mid-afternoon, more wine at dinner time, whisky in the evening. EVERY night.
I don't think either of them are being honest with the GP or consultant at the memory clinic who sees them every 3 months about how much he is drinking, and how it affects his mood/behaviour. On the other hand, they know that the GP will just tell him to stop and he won't. It's very hard on my mum, they currently have no support but I think it's getting to the stage we need to start exploring that even if just to give mum respite - she doesn't want to leave him on his own for more than 5 minutes as he may just wander off.
Before lockdown we'd found all these dementia support groups and activities and just as we were getting details, everything stopped. We're in Scotland and many things haven't resumed yet. Or the support groups are being done on Zoom and parents cannot/will not engage with technology.
Discussing with DH last night and I'm tempted to email their GP and lay out everything we have observed during our visits and expressing concerns. I know the GP cannot engage directly with me or my brother about his medical treatment or history but they can take our views and observations into account surely.
I am also thinking I will have to juggle things here and try to make the time to visit at least once a week, if just to give mum respite or help her tackle the gardening.
I'm well aware that things are only going to get worse from here on in and I think mum is too. They are both very reluctant to see the doctor, ever, or call for help. We had one situation about 6 months ago where Dad was being incredibly irrational, refusing to get up out of his chair, and kept repeating to mum that he was dying. Brother and I advised mum to call 999 and get him assessed in A&E. She flat refused. I have said to her on many occasions that I would like to be involved in one of their appointments at the memory clinic with the consultant, but that's banned because of Covid. 
Anyway. Just needed to vent. It's really upsetting seeing your Dad not recognise his grandson. Luckily DS didn't hear, he'd have been absolutely gutted.