My tiniest beardie weighs 4.6 grams and loves to run up to his sibling (6.2 grams) and rubs his face all over him....
I don't know if he's trying to dominate a beadie that's larger than him because the bigger one only has three legs? Or is he playing?
Its quite amusing though
You should get them separate enclosures before something bad happens. They don't play, so it is probably aggression and aggression warrants retaliation at a certain point.