A few I had in mind at the moment:
parents:starek -> parent:starlight glimmer, parent:lord tirek, offspring, interspecies offspring
parents:chrystirek -> parent:queen chrysalis, parent:lord tirek, offspring, interspecies offspring
(and on that note, parents:chrysrek should probably be aliased into parents:chrystirek)
parents:tirekcord -> parent:discord, parent:lord tirek, offspring, interspecies offspring, magical gay spawn
parents:sombrek: parent:king sombra, parent:lord tirek, offspring, interspecies offspring, magical gay spawn
parents:celestirek -> parent:princess celestia, parent:lord tirek, offspring, interspecies offspring
parents:twiswirl -> parent:twilight sparkle, parent:star swirl the bearded, offspring
parents:omniship -> parent:twilight sparkle, parent:rainbow dash, parent:fluttershy, parent:rarity, parent:applejack, parent:pinkie pie, offspring, multiple parents
@Background Pony #D36B
I suppose it might be argued that cases where the offspring isn’t a hybrid would be rare enough to justify adding the implication anyway and removing it in the minority of cases where it doesn’t apply.
It does happen on occasion where two parents of different species produce an offspring that is only of one of those species, but that’s surprisingly rare, which is why interspecies offspring and hybrid are always implied together. It’s considered more troublesome to add it separately than it is to remove it in the rare instance where the resulting child is not a hybrid creature.
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