I mean, two of them are and one is goku jr, sooo

One of them isn't canon and another only appears in Super, sooooooooooooooo.....
Not knowing is pretty reasonable

If you say all of them you haven't watched the show. Bardock, Turles and Goten appear in Z so you should know they're not all the same. And if you were to guess only having watched Z you would have never seen what looks like kid Goku ( Goku Jr ) of what looks like another version of Goku ( Goku Black ). You would point at the most obvious one. If you pointed at Goku Black, for example, you clearly were lying because you wouldn't know who he was, or would never see Goku wear those clothes.therefore not point at him. Same goes for Goku Jr.

Is Turles canon thouggh?

Oh my gosh, I just realized that Gotens a kid and so Is Goku Jr so that means that Pan is still super young but that's her kid...

huh?

So, Goku Jr is Pans kid ( Dragon Ball GT or Heroes, not too sure ). Goten seems around the age of 11. At this time, Pan was under the age of 2. So, judging by the picture, before Pan was 2 she gave birth to Goku Jr.

My bad, he isn't. He appears in the movie The Tree Of Might, which isn't a canon movie.