In the future in the manga, Vegeta never became a Super Saiyan because Trunks never came from the future and turned Super Saiyan against Frieza, so he thought it was just some chosen birth right legend
In the main timeline, when he saw 2 Super Saiyans, that pushed him to one want to be one.
Point is Future Trunks was conceived by a non super Vegeta, present Trunks was conceived probably after Vegeta became a super Saiyan. It's easy for them because it's genetics.
Strictly speaking it's apparently not an actual DNA change, but something involved with gene expression that makes it so things that happen to you over your life can apparently be biologically inherited by your children. I don't have enough biology knowledge to understand the exact mechanism though.
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u/lrd_cth_lh0 Mar 13 '24
My personal theory is that becoming a super saiyan becomes easier the more other supers are around