You must try to talk him out of doing this, My Grandson's other Nana's Boyfriend did exactly that last Christmas, he went to Cardiff, picked his Daughter up and took her to her Mother's house, that was on 1st December, on 10th December he tested Positive for Covid, on 20th December he was admitted to Hospital, and on 31st December he died, and his Daughter wasn't even infected with Covid so he thought he would be okay, luckily no-one else was affected because other Nana had told him she wouldn't allow him back into her house unless he Isolated for 10 days after getting back from Cardiff, sadly it meant that she never got to see him again.