1. helpie and derpy! poor derpy has gone through so much when it comes to pregnancy, her first pregnancy was a disaster and this one didnt go so well either, at least this time she had a loving pony to help her through the rough time. derpy and helpie had a very positive relation growing up, derpy was always so proud of her daughter and gave her unconditional love and support. derpy sometimes got outrun by her daughter though, helpie is very intelligent and a bit of a show off and sometimes shed like to tell her mam how mothering goes. both derpy and doc would just laught at her because helpie's logic was "cupcakes and icecream for breakfast"
2. rarity and juju! these two grew closer as they aged, once juju was born rarity found herself confused and she didnt exactly know how to mother a dragon hybrid, even though spike did most of the mothering when juju was newborn rarity still made time to bond with her son, only when wearing non flammable clothing articles of course
3. twilight and midnight! midnight was a total mamas boy, he loved his father dearly but he was much closer (and still is) with twilight. when little midnight would follow his mam everywhere and usually throw a tantrum if he wasnt within 2 metres of her, i think you can imagine how hard this made parenting, especially when mid's older sis wanted love from her mama too.
4. pinkie and twisty! for those of you who hadnt already guessed, twisty is actually the daughter of glida and greta. unfortunately greta's pregnancy was a mistake (i headcanon glida as a trans ma'am and since griffins dont have acess to much magic i imagine she probably hasnt sexually transitioned yet) and when twist was born glida and greta had no home ready for her, so glida offered to give twist's egg to a longtime friend, pinkie who had struggled a lot with fertile issues between her own husband. pinkie happily accepted and raised twist since day one. twist has never seen glida and greta, she does know who her parents are but both of her parents are too busy to ever visit her in ponyville. anyways time for the relation between pinkie and twisty. twisty being a griffon grew up a bit slowly than ponies do (physically at least), it took her a very long time before she even began simple baby talk so when she was younger things between her and pinkie werent very talkative. they were very fun though! plenty of trips of fun and plenty of 'bear rides', twisty had a wonderful childhood and although she never got to express it she always had very much fun with her mama
5. flutter and melody/ace. both ace and melody didnt have much of a brain when they were younger so they pretty much just shared one. the two did evrything together (even though they still co) and werent much of sepreate individuals but much more of a pair. flutter loved her two children very much, even though melody is the only one who can hear ace talking, flutter always understood that ace was always insecure about not really being a pony like the other kids. flutter unlike most adults treated ace and melody as sepreate people, which is what made them develop their own brains and heart. all thanks to fluttershy!
6. rainbow/apple and fizz! poor apple was still rather depressed after a few years of total chaos (granny dying, her and flim's breakup) apple didnt find much joy until zapple was born. shortly after fizzle slipped outta da womb! fizzle was a goof, an adorable goof, while zap was the smart one, fizzle was the silly comedic relief apple had needed. rainbow loved both her sons very much, and when fizzle was young all she could think of was having another kid just to experience the joy! (they ended up having four kids, they are children people)