Ability Score Increase
Your Constitution and Dexterity scroes increase by 1. Gain +1 in an ability of your choice.
Age
Dwelves age slower than humans and have long lives, but not as long as pure elves. They mature around maybe 100 and live to perhaps 500.
Size
Dwelves are taller than dwarves, but not to the extent they would be if they were pure elves. Your size is Medium.
Speed
Your base walking speed is 25 feet.
Darkvision
Thanks to your bloodline, you have superior vision in dark and dim conditions. You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can't discern color in darkness, only shades of gray.
Awkward Composition
Your very being is considered an abomination to some in the dwarven and elven communities. You have disadvantage in Charisma checks with dwarves and elves.
Tool Proficiency
You have proficiency with smith's tools or your choice of any one type of artisan's tools.
Mixed Ancestry
You have Advantage on saving throws against being poisoned, charmed and put to sleep.
Language
You can speak, read, and write Common Elvish and Dwarven.
Feature Choice
Parental Dwarf Subrace Feature.
.
Or
Parental Elf Subrace Feature