From left to right we have:
Gala Rose
Sunset Shimmer
Big Mac
Helios
Kindle Sparks
The relationships in this family is a bit complicated. Kindle Sparks and Gala Rose are both close with both of their parents. Helios on the other hand is only close with his mother. His relationship with his father is very strained.
Big Mac unfortunately passed away when the kids were still young. Gala Rose was so young that she doesn’t remember her father very well, she remembers him enough to know they were close, but not much else.