I find there is a fine line between offering help to my Mum (90) and taking away her independence.
She is/always has been very independent, and I almost have to guess which things are becoming a struggle for her.
Recently I took over changing/washing/drying her bedding, which she admits is a great help, but she insists on still doing her clothes washing.
I found out last week that she has been taking her cordless vacuum cleaner upstairs to use, as she has forgotten/doesn't know how to empty the upstairs one. How she has been doing this is a mystery, as we have had to have a second handrail fitted just so she can manage the stairs! I've offered to do the actual vacuuming for her, but she insists she can manage. ( She has at least consented to me doing the stairs carpet, as her hand held vac is a little heavy)
I try to do things as I notice them,( ie weeding her front steps) but don't want her to feel that I think she can't cope.
I am an only child, so there is only me and DH to help. To the OP - please ask if you need help, your son just may not realise. Otherwise, do the cleaning a little at a time, even 30 mins a day will eventually get it done! x