Is there any pokémon that is related to each other?

I never thought about it until now. Only pokémon that I can think is "related" to each other is mew and mewtwo. Mewtwo was created by mew dna and share some traits aka typing. Other than that, they are different from each other. Other pokémon I can think is latios and latias. People consider them brother and sister. Just don't know pokémon fully consider them as such