Fics like Two Worlds, One Family

A father who has just lost his family finds a son who has also just lost his. This actually has the potential to work surprisingly well.

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1. What's She Doing Here? by kittyhazelnut (Phineas and Ferb)
2. Blut ist Dicker als Wasser by DesdemonaKaylose (Phineas and Ferb)
3. Myriads of Shards of the Connexions between Us by WinryWeiss (Phineas and Ferb)
4. Watching of Across the 2nd Dimension by Razena (Phineas and Ferb, Phineas and Ferb the Movie: Across the 2nd Dimension (2011))
5. Adrift by AvidHouseHusband (Gravity Falls)
6. Phineas and Ferb Chatfic Because I Can by Maxils (Phineas and Ferb, Dwampyverse)
7. You pulled all your stitches out because you had to fistfight me by KissingLizard (Phineas and Ferb)
8. The Pines Paradox by BrownieFox (Gravity Falls)
9. Saved From The Lab Coat by kittyhazelnut (Phineas and Ferb, Milo Murphy's Law)
10. Stuck on You by Clouds (Miraculous Ladybug, Phineas and Ferb)
11. Let's all assume the worst by KissingLizard (Phineas and Ferb)
12. The Transmigratinator by Boomchick (人渣反派自救系统 - 墨香铜臭 | The Scum Villain's Self-Saving System - Mòxiāng Tóngxiù, Phineas and Ferb)
13. Pastel Sailboats by emjam (Gravity Falls)
14. flee from your ghosts (burn your house down) by thepolysyndetonaddictsupportgroup (Gravity Falls, Over the Garden Wall (Cartoon & Comics))
15. The Misconception by KissingLizard (Phineas and Ferb)
16. Feels Like I'm Somebody Else (I Get Overwhelmed) by roseverdict (Gravity Falls)
17. I'll Be Honest With You by KissingLizard (Phineas and Ferb)
18. frittatas and steaks by dearingsattler (Phineas and Ferb)
19. I’m pretty sure Uncle Bill isn’t human by Lost_In_Wonderland12 (Gravity Falls)
20. the mortifying ordeal of whatever the hell just happened by untrustworthyglitch (Gravity Falls)