Support bubbles, DP’s son has to SI

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Asking because I cannot find a definitive answer to this. There’s lots of confusing advice!
My partner and I live apart (selling houses has been stalled by COVID!) We were planning to spend Christmas Day together at his house with our respective children. We both live alone so our support bubble is all well and good- have been together for over 4 years, all children get on etc etc.
This morning his son received a notification from school that he needs to self-isolate until Monday. He will be doing this at his DP’s house as he has arrived there for contact today. I haven’t seen the son since last week but have seen DP since he had his son at the weekend.

My question is, can we still go there for Christmas? Son isn’t leaving the house, since seen DP, he’s in our bubble... can we carry on as planned or do we need to stay home?
I just can’t work it out!

AFAIK you can still go there as you are classed as one household.
Whether that's wise or not is up to you!

You can but you probably shouldn't, the numbers are horrendous right now.

That’s pretty much what I thought. We do live as one household (albeit in our separate places) and have all self isolated in the past when one of us was symptomatic.
I know it’s perhaps not the best thing with rising cases. None of us have any vulnerabilities and can all isolate together after as have no commitments for a good ten days.
I shall ponder it more. Thanks

Yes you can as it’s just your partners son who has to isolate and none of rest of the household. If you are in a support bubble you are one extended household really. If you are willing to isolate after I don’t see an issue with it.