Wasn't sure what y'all were talking about with reference to a seed "interbreeding" but polyembryony is a thing with cannabis where it'll throw two taps, two stalks and its crazy and "blue lobster" rare. I've only seen polyembryony once and it was an avocado seed. It threw three taps and two stalks. What can also happen is a meristem split, triggered by genetic turbulence, environmental stress, aa couple different things. Below is a current derp plant of mine that went through a natural meristem split at the first node. It wound up growing four branches. I snapped a pic at the split but it's hard to see... plant started throwing clubbed leaves, said screw this and abandoned the top
grew around it from beneath the defect.
I also threw in a pic of my polyembryonic avocado plant so you could see one.