Dire Bare
Legend
That's not how D&D works. Perhaps, it should be, but it isn't.Subraces are not the same as cultures. If a high elf is raised by Dwarves in Dwarven culture its subrace is still Hifh Elf, but it culture is Dwarven. Race/Subrace most have either a biological or metaphysical difference no matter what culture they are raisedcm in.
Subraces don't match perfectly to cultures, they are an inconsistent mix of "species" and cultural traits. But, IMO, they are mostly culturally based. What's the difference between a high elf and a wood elf? Mostly, it's culture.
So, in my game at least, an elf born of high elf parents but raised in dwarven society would be an elf with a dwarven culture, but would not be a high elf. However, he might be interested in his high elven heritage and embrace it later in life . . . .