V02 changes:

no main trigger, more stable, less comic (still have)
normally 1girl + 1boy should be enough to trigger it, if need help, use mother and son or siblings
if gender is swapped (occasionally), use tall female or breasts, if the base model can't appoint the genders. there's a chance the boy will be taller, then use shota (it'll make the boy reaaaally small sometime)
use size difference if the base model is really having a difficult time
put solo in neg if the base model is biased toward solo, comic, panels if the lora triggers base model to do more comic than you'd like to see.

Basic prompts:

1boy, 1girl, shota, tall female, breasts, siblings, mother and son, size difference

you can gender swap with this lora, just prompt tall male, short female, something like that

I feel the civ doesn't like "size difference/ age difference/ height difference", had a difficult time to upload pictures

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V01:

Basic prompts:

bigsislitbro (if the effect is not too strong on the base model, use this), girl and boy, 1girl, [description of girl], 1boy, [description of boy], action, size difference/ height difference if needed

Necessary negs:

comic, monochrome, panels (because majority of dataset is manga pages), solo (to reduce the model's bias toward single person imgs)

you can gender swap with this lora, just prompt tall male, short female, something like that

I feel the civ doesn't like "size difference/ age difference/ height difference", had a difficult time to upload pictures