Starscream, Slipstream, Thundercracker and Skywarp are siblings (Thundercracker is the oldest, Skywarp is the middle and Starscream and Slipstream are the youngest child)
Headcanon 3
Starscream, Slipstream, Thundercracker and Skywarp are siblings (Thundercracker is the oldest, Skywarp is the middle and Starscream and Slipstream are the youngest child)