My current Head canon on Derpys family tree. Keep in mind this is my head canon and I will keep it as is until any thing in the show happens that makes it needed to be changed.

Script: Older brother to Derpy, Ditzy and Crackle. Married to Carrot Top, Derpy's best friend.

Dinky Hooves: Derpy's Daughter with a unicorn stallion who is no longer around.

Ditzy Doo: Derpy's twin sister. Loves coming to Ponyville to aid her siblings in winter wrap up despite her being accident prone and being unable to differ directions, sometimes mistaking north for south.

Crackle Pop: Younger brother of Script, Derpy and Ditzy. Recently just moved to Ponyville with his parents.

Carrot Top: Derpy's best friend for a long time. Married to Script.

Tornado Bolt: The daughter of Carrot and Written Script.

Sparkler: Dinky's babysitter and adoptive big sister.

I made Bolt the child Script and Carrot' due to her strong resemblance to Script and she can be seen standing close to Carrot multiple times.

Derpy, Dinky, Doctor Hooves, Carrot Top, Written Script, Sparkler, Ditzy Doo, Tornado Bolt, Crackle Pop and MLP belong to Hasbro
Made on the pony creator and paint.