Speaking mostly here of the "main" 616 universe, because I know it can vary, but other versions with siblings would be interesting to see.
The reason I ask is because, for Bobby especially, these relatives seem to "pop up" and then are casually forgotten. Jean, Gambit, Lorna, Sam Guthrie (to the nth power!), Scott, of course, and a number of other X-Men all have siblings that have (more or less) been kept canon. Bobby Drake's seem to constantly "shift" though.
The first mention of a sibling I remember was in the 1980s Spiderman and his Amazing Friends cartoon. He had a sister who was also a mutant with light-based powers, called Light- Wave, seen here:
She's in one single episode, and never mentioned again. I know we can't really take this show as canon, though; Bobby was also "weak" against heat and blazingly straight in that version.
The next big instance was in X-2: X-Men United, where we see his either jealous, scared or just plain dick of a younger brother, Ronnie, sell him and his friends out to the police. I always thought that was because unlike Bobby, he was a Flat Scan.
Again, we can't take this as canon, because, 1, it's a movie, and 2 his parents were Surprised at his mutancy; canonically, Bobby and Hank were two X-Men who had full use of their mutations from birth.
I recently came across an old [90s] comic, where both X-Men strike forces were taking on Cortez and the Acolytes, and Bobby was making a massive snowball to launch at Piotyr because when Bobby had offered some kind, if clumsy words of comfort about his sister Illyana, Piotyr basically brushed him off saying he wouldn't understand because he was an "only child".
So it got me to wondering...
Is Bobby the only child in main universe?
What about other versions?
Is this something like in some continuities, Scott is the older Summers brother, where in others, Alex is?
