The night at Bones Manor had Amelia Bones crying herself to sleep every night because her niece and her Betrothed both died at the end of the Triwizard Tournament last year.
Sirius stayed with Amelia during the day but went to Order Meetings at night to keep himself occupied from thinking about what to them that night. One day while he and Amelia are at Potter Manor they get an owl post from Croaker in a letter to Amelia. She opened it and read it.
Dear Amelia,
I've went over the evidence several times, and now i've come to the conclusion that Lord and Lady Potter turned into Phoenix Ash. Why I don't know. Ask Sirius if Harry's and Susan's Animagus was a Phoenix.
Algie.
Department of Mysteries.