Even DBZ 18 would probably win IMO.
The only verifiable gauge of Kaioshin's strength is his statement of being able to kill Namek arc Freeza with one blast, but 18 at that point could do the same.
Piccolo
But for his actual parents, Chi-Chi is the obviously better one between her and Goku. She actually raised him while Goku is more like an older brother.
The fact they were much weaker made them easier to control and act in line with Dr. Gero's vision of being a mindless killing machine, but they were still strong enough to rebel against Gero himself.
19 was weaker than Freeza before absorbing Goku's energy so course Gero could control him...
Krillin was able to hold his own for a bit when Goku was messing around but he lost just as badly when he got serious and that wasn't even his Battle level. Krillin doesn't need to be more power than Chapa-o for the statements to work.
Remember Chapa-o underestimated Goku greatly and suffered...
Krillin and Yamcha were shocked Goku defeated him so easily and when Goku admitted he didn't come close to actually trying, they basically called it quits while Jackie Chun started to fear for his chances against him. They don't need to be stronger than Chapa-o at that point.
If you like fighting games, you will love FighterZ. However, if you're expecting it to be anything like Tenkaichi or Raging Blast, you probably won't like it. It's Story is very boring and Arcade is broken. It's fighting mechanics also don't give you the same feel of a DBZ fight like Spike's games.
Battle Angel Alita: Last Order
Fire Force
One Piece
Dragon Ball Super
My Hero Academia
Komi Can't Communicate
Don't Toy With Me, Miss Nagatoro! (I'm ready)
Kid Chi-Chi is definitely stronger, but seems to be largely untrained. Videl could possibly subdue her due to have much more experience but it would be an uphill battle.