Confused about bubble

[Hoppinggreen]

My friend has recently left her husband and lives one week one one week off with her 13 year old DS. She is going to join our household as her support bubble and from what I have read this is ok as her DS is under 18. I know she is effectively part of our household now (4 of us plus her) but I am not sure what the situation with her DS is.
Can we go to her house the week he is there and can he visit us with or without her?
Not trying to find any loopholes, I want to stick to the rules but I genuinely don’t know. I THINK he is part of our household too but I am not sure

Yes her DS is part of the bubble too. I am a single parent with 5 and 9 year old and we are bubbled with my parents.

I don't think she can bubble with you as she is bubbling with the boy's dad.

Yes that's allowed, the fact the son goes to his dad every other week is an exemption as children are allowed to move between households

mustard I don’t think that’s right. She doesn’t see him apart from if the DS needs to be dropped off/picked up so they aren’t a bubble

Yes it’s allowed and he’ll be part of you’re household but you need to consider the risks of him also swing his dad so i effect your bubble will be bigger. If you don’t have vulnerable family in your household then it shouldn’t be a problem!

Ah yes thats right, I've misunderstood that all along then!