Of course @Veronicaaa beat me to it.
Writing it all out and looking through all the tweets made me realise that I'm as sure as I'll ever be that they were living in the same bungalow since December 10 (or before). JM makes multiple references to three people and adultSSSSS in the house. Her cryptic tweets when she first announces that they have to self-isolate because of SB's teacher, but then it becomes apparent there is another reason also fits perfectly in the timeline. Said reason being that at the point of the teacher tweet, BB had been self-isolating for 4 days and is waiting for a test results and JM and SB should have stayed at home.
Writing it all out and looking through all the tweets made me realise that I'm as sure as I'll ever be that they were living in the same bungalow since December 10 (or before). JM makes multiple references to three people and adultSSSSS in the house. Her cryptic tweets when she first announces that they have to self-isolate because of SB's teacher, but then it becomes apparent there is another reason also fits perfectly in the timeline. Said reason being that at the point of the teacher tweet, BB had been self-isolating for 4 days and is waiting for a test results and JM and SB should have stayed at home.