Due to the reality-changing events of Flashpoint, the members of the Super-Family had their memories altered and their history re-written so that they forgot about their bonds. Although Superman, Supergirl, Superboy and other team members have worked together since, their relationship became more strained and distant for a while until it was restored: Superman and Supergirl patched things up after her Red Lantern stint, and Supergirl defended Superboy from her own teammates, apologizing for mistreating him in the past. Prime-Earth Superman faced his own mortality and saw that Supergirl was ready to replace him.
Superman was made aware that reality had been tampered with by someone massively powerful and he needed the whole Super-Family to fight him, so he visited each member: Supergirl, Steel, Super-Man, and Superwoman and asked them to fight at his side when the time comes. The Super-Family had their first test when a new Superman Revenge Squad was put together by Cyborg Superman to destroy Superman once and for all.
Members:
Superman
Supergirl
Superman (Jon Kent)
Superboy (Conner Kent)
Steel (John Henry Irons)
Steel (Natasha Irons)
Super-Man
Otho-Ra
Osul-Ra
Former Members:
Superwoman (Lana Lang)
Lex Luthor