Pick one of the following abilities that reflects which heritage you feel your character leans more toward.

Dwarven Resilience

You have advantage on saving throws against poison, and you have resistance against poison damage (explained in the Player's Handbook).

Fey Ancestry

You have advantage on saving throws against being charmed, and magic can’t put you to sleep.

Dwarf-Elves mature at the same rate as elves, but they’re considered young until they reach the age of 50. On average, they live about 550 years.

Dwarf-Elves stand between 5 and 6 feet tall and average about 175 pounds. Your size is Medium.

Your base walking speed is 30 feet. 

Accustomed to life underground, 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.

You have proficiency with the battleaxe, light hammer, shortsword and longsword.

Whenever you make an Intelligence (History) check related to the origin of stonework, you are considered proficient in the History skill and add double your proficiency bonus to the check, instead of your normal proficiency bonus.

You can speak, read, and write Common, Dwarvish and Elvish. Dwarvish is full of hard consonants and guttural sounds, and those characteristics spill over into whatever other language a dwarf might speak.  Elvish is fluid, with subtle intonations and intricate grammar. Elven literature is rich and varied, and their songs and poems are famous among other races. Many bards learn their language so they can add Elvish ballads to their repertoires.