Swinton of Michael Clayton fame has two partners: 67-year-old director, artist and playwright John Byrne and 29-year-old painter Sandro Kopp. There is more to their affair with Byrne revealing that he has another lover named Jeanine Davis. Byrne said that Tilda is happy with his affair with 42-year-old Jeanine and that they had met. He added that the arrangement works, as Tilda too has Sandro.
Swinton and John live together in Scotland with their 10-year-old twin boys.