Queen Haven I think is the Best Mother by far as she always has a lot of care of her Daughters (Zipp Storm and Pipp Petals), a good singer hints how Pipp got into singing and she does has her moments.
Funny story before A new Generation came out is I thought Queen Haven would be the Main Antagonist in the series only to turn out the real Villain afterwards is Sprout Cloverleaf and his mother (more on her later), but I'm glad Haven isn't and pretty much grew on me as she has become my new G5 MLP Character.
Phyllis Cloverleaf I felt was worst than Sprout as she did taught her Son on to hating other ponies that have wings or horns and pretty much making her Son a War criminal. Although she did changed but pretty much disappeared and never came back in Make your Mark (She did made 2 appearance in Tell your Tale and never appeared again afterwards.)
Opaline Arcana, Oh boy we all know what you're worst for. Although not a mother but did raised Misty in her "care" and pretty much making Misty go through Trauma and a living nightmare.
I had plans on making Opaline's backstory prier to the events of the G5 series and before the Make your Mark Chapter comes out and see what I can piece together on her younger life, why she threats misty like noting and how she divided the Pony race till they got back together again.
either way Hope you like my new meme and hope we get more G5 parents involved in the series.