I don't think the OP is in any doubt that 7 is more than 6. A sensible question has been asked, and a situation given where if the question was 'does this increase the risk of COVID to the people who will not see the DD's BF?' the answer would be 'marginal if at all, if sensible precautions are taken'.
But we obviously also need to obey the law.
There are situations that are legal that do not increase risk - great!
There are situations that are legal that do increase risk - your choice how cautious you want to be for your sake and everyone else's.
There are situations that are illegal that do not increase risk (eg 4 mothers walking together pushing prams) - I wouldn't break the law but some people might asses risk differently.
There are situations that are illegal and do increase risk - most sensible people wouldn't do them, and nobody should.
The OP is trying to work out which category she is in.
The rest of this post is a copy from my post on the other thread I linked to:
In a thread where people are referring multiple times to the actual legislation, it would help if people could say why they believe it to be legal or illegal.
So far we have:
Illegal because they are all in the same 'place' (house and garden) vs
Legal because the legislation refers to gathering and they are not all of the same gathering.
Any other reasons people think it may be illegal/legal?
So we need to ask:
If you think it is illegal then how do you read the legislation definitely saying gathering = everyone on the private property?
If you think it is legal why do you think that everyone on the private property should not be considered part of the gathering?