1.
Amy Bruckner played Pim Diffy on Phil Of The Future:
This is her now, she’s 31:
2.
Maisy Stella played Daphne Conrad on Nashville:
This is her now, she’s 18:
This is him now, he’s 32:
4.
Tenzing Norgay Trainor played Parker Rooney on Liv and Maddie:
This is him now, he’s 21:
5.
Savannah Paige Rae played Sydney on Parenthood:
This is her now, she’s 19:
6.
Xolo Maridueña played Victor Graham on Parenthood (not the youngest sibling, because Sydney was, but just go with it):
This is him now, he’s 21:
This is her now, she’s 34:
This is him now, he’s 23:
10.
Madeline Zima played Grace Sheffield on The Nanny:
This is her now, she’s 37:
11.
Parker McKenna Posey played Kady Kyle on My Wife And Kids:
This is her now, she’s 27:
12.
Mackenzie Rosman played Ruthie Camden on 7th Heaven:
This is her now, she’s 33:
13.
Jake T. Austin played Max Russo on Wizards of Waverly Place:
This is him now, he’s 27:
14.
Kyle Massey played Cory Baxter on That’s So Raven:
This is him now, he’s 31:
15.
Madison Pettis played Sophie Martinez on Cory in the House (I knowww she’s not a little sibling, but she’s kind of the little sibling of the show):
This is her now, she’s 24:
16.
Mia Talerico played Charlie Duncan on Good Luck Charlie:
This is her now, she’s 14:
17.
Skai Jackson played Zuri Ross on Jessie:
This is her now, she’s 20:
18.
Moisés Arias played Rico on Hannah Montana (again, I know technically not a little sibling, but counting him as a little brother because he’s very little-brothery):
This is him now, he’s 28:
19.
Atticus Shaffer played Brick on The Middle:
This is him now, he’s 24:
20.
Aubrey Anderson-Emmons played Lily Tucker-Pritchett on Modern Family:
This is her now, she’s 15:
21.
Kamil McFadden played Ernie Cooper in K.C. Undercover:
This is him now, he’s 26:
22.
Noelle and Cali Sheldon played Emma on Friends:
This is one of them then (no idea which):
This is them now, they are 20:
23.
August Maturo played Auggie Matthews on Girl Meets World:
This is him now, he’s 15:
24.
Tyree Brown played Jabbar on Parenthood:
This is him now, he’s 18:
25.
Jacob Smith played Owen Salinger on Party of Five:
This is him now, he’s 32:
26.
China Anne McClain played Chyna Parks on A.N.T. Farm:
This is her now, she’s 24:
27.
Davis Cleveland played Flynn Jones on Shake It Up:
This is him now (on the left), he’s 20:
28.
And finally, Dylan and Blake Tuomy-Wilhoit played Nicky and Alex on Full House:
This is Blake now, he’s 28:
And this is Dylan now, also 28:
Source: https://www.buzzfeed.com/lyapalater/youngest-siblings-from-tv-shows-then-and-now