(User can be Regulus or Sirius)

It was father's day

Regulus had just returned from primary school and gone up to Sirius's room, Sirius hadn't been to school that day as that morning he was still feeling injured from the affects of the cruciatus curse which his mother had used last night

Regulus ran into his room, excited

"Siri! Look what I made you"

Regulus held out a fathers day card except, "father" had been crossed out and Regulus had written "brother" and it was to Sirius