The trouble is, everyone's circumstances are different.
Family A, may comprise 2 people.
Family B could be 7 people.
Clearly, there is a greater risk if 2 family B's meet up indoors than if 2 family A's meet - assuming both A's and B's are following guidelines.
It only takes 1 careless eejit to scupper things for all.
I have a friend round to visit x 1 weekly.
She is the only person who comes in to our house, other than DH and I.
She and I sit with doors open - to outside, if weather permits, if it doesn't, we don't - husband stays in "his" room for the duration of her visit.
We sit just about 2 metres apart. No hugs.
I clean down door handles and house key before she comes, leave door unlocked and she just walks in and locks up behind her.
She has no need to open any other doors, once inside (other than toilet door).
She has sole use of downstairs loo while here (which has been cleaned including door handles and lock).
She has sole use of a mini soap dispenser, own clean towel, new toilet roll etc and I clean everything again after she's gone (my choice).
We drink wine and put the world to rights.
It keeps us both sane.
We shall continue in this vein as long as situation requires.
We are both careful and cautious in between visits and trust each other.