I think some journalists need to investigate whether there were other family or friends, who were nearer to his parents to help them out, thus his journey would not have been essential.
How many houses this man owns is irrelevant, if he can afford them, but wherever he was on lockdown day is where he should have stayed for the whole time-no excuse there at all. He would have been forewarned of the date so could have travelled to his family on the Monday that Boris announced it, and worked from home the whole time there. In my opinion, this is a resignation matter, just as the Scottish Health Minister had to.