Ta-da! I changed this!
 
Now this was a bit hard for me cause like I have 3 ships with Twilight, Twilight x Sunset, Twilight x Tempest and Twilight x Rainbow! but I couldn’t part with my first few ships and Twidash is one of my parings for my next gen!
 
So introducing Crimson Vision and Morning Whistle! the daughters of Twilight and Rainbow!
 
How did they come to be? well, both Twi and Dash wanted to carry the foal, they talked back and forth on who should carry their first child and who got to carry for the next. For nearly a month they argued over it, till finally Spike got tired of it.
 
“Why don’t you both carry?”
 
Twilight and Rainbow blinked at Spike, “huh?”
 
“Well, you both want to carry your foal, and you been arguing over who gets to for nearly a month, so why not both of you carry it and end this debate” Spike huffed as he crossed his arms.
 
Twilight open her mouth to disagree when she paused, Spike was right, it was a simple answer to their problem, looking over to Rainbow, the alicorn found that her wife was probably thinking the same thing.
 
“Both?” Twilight asked Rainbow, who in return smirked.
 
“Both”
 
“Both” They nodded together before looking back at Spike.
 
“Both is good”
 

 
So! Thanks to a gender switch spell, Twilight and Rainbow soon found each other pregnant. They were hoping their foals would be born on the same day, and luck would have it they almost where. Crimson Vision was born first and hours later ( at 5am the next day) Morning Whistle was born.
 
Crimson gets her much darker colors from her grandfather, Nightlight, and her blue colored eyes from her grandmother, Twilight Velvet.  
Yes Crimson use to be a Twilight x Tempest adopt, but I changed it cause why not lol
 
Morning Whistle gets her yellow eyes from both her grandparents, but mostly her looks come from her mothers, hence why her hair color is more of the velvet like colors, lol